I need to check the the coloured wires are in the right spot

What colour spark is at leads is it nice blue colour.If not more than likely faulty coil or coil packs.Strong smell of fuel indicates electricals not right.If electrics are correct you need to check all injectors.And fuel rail they block up sometimes old age rust

It says the tachometer wire is Yellow/Green, you do not have that listed. You will find it in the list below, it is highlighted..

WIRING INFORMATION 2001 Subaru Legacy

WIREWIRE COLOR LOCATION

12V CONSTANT WIRE WHITE Ignition Harness

12V IGNITION WIRE GREEN Ignition Harness

12V ACCESSORY WIRE YELLOW Ignition Harness

STARTER WIRE WHITE/BLACK Ignition Harness

POWER DOOR LOCK (-) WHITE Harness In Driver's Kick Panel

POWER DOOR UNLOCK (-) GREEN/RED Harness In Driver's Kick Panel

PARKING LIGHTS (+) ORANGE At Light Switch

DOOR TRIGGER (-) PINK/BLACK In White Connector Behind Fuse Box

TRUNK TRIGGER (-) YELLOW/BLUE In White Connector Behind Fuse Box

TRUNK RELEASE (5-wire) LT.GREEN/YELLOW At Motor In Tail Gate

FACTORY ALARM ARM (-) Factory remote only

FACTORY ALARM DISARM (-) Factory remote only

TACHOMETER YELLOW/GREEN At Ignition Coil

BRAKE WIRE (+) WHITE/BLACK At Brake Pedal Switch

HORN TRIGGER (-) RED/GREEN Harness At Steering Column

LEFT FRONT WINDOW UP BLUE/RED At Driver Window Motor Inside Door

LEFT FRONT WINDOW DOWN BLUE At Driver Window Motor Inside Door

RIGHT FRONT WINDOW UP BLUE/RED Harness In Driver's Kick From Driver Door

RIGHT FRONT WINDOW DOWN BLUE Harness In Driver's Kick From Driver Door

LEFT REAR WINDOW UP BLUE/RED Harness In Driver's Kick From Driver Door

LEFT REAR WINDOW DOWN BLUE Harness In Driver's Kick From Driver Door

RIGHT REAR WINDOW UP BLUE/RED Harness In Driver's Kick From Driver Door
RIGHT REAR WINDOW DOWN BLUE Harness In Driver's Kick From Driver Door

datsun 720 coil diagram Google Search

are the wires plugged in the order they were on?

3 4

2 1


4 3 2 1 front of motor ---->


1 4

2 3

couple of things
does the mustang have a ballest resisor fitted between the ign switch and the coil? in which case it should be a 9v coil or remove the ballest resistor to run a direct 12v feed from the ign switch, or just to test run a 12v feed direct from battery to coil.
the feed to the dissy is switched by the points opening unless you have electronic ignition,
but in both cases the capacitor/condenser may have broken down causing a consent feed hence given permenant live through the coil,
to test if you have points rotate engine so points are closed, put meter on coil and test if volts change when you open the points, or a spark out of ht to dissy lead
if electronic ign you will have to rotate engine or dissy to activate spark ,

make sure u have the wires in the correct spots, there is a firing order, u need to have them in the right spots or else it wont fire, call ur local parts store and they will give u the firing order

weak spark is no fuel issue but sign of distributor problems. seen age you still have contact points and conventional distributor cap.
Check contacts points and contact gap, feeler gauge will be enough at maximum opening when turned around. Incorrect issue is no weal spark issue either. Cracks in the cap are or worn points or dirty lead. Then the ignition coil should be good still. der-ust, clean up all contacts/terminals. Clean grease and other debris as well. If points or cap no good, replace points may be cleaned a bit carefully with sanding paper (Did that only on 1000 imported japanese cars from mayor port as a student to drive them to a parking lot.)

Timing can be set by a stoboscopic light for proper pre-ignition
you need one of those dwell angle strob light instruments.

Whole other list possible while it will not run. Battery ok?
Vacuum to distributor ok. Distributor weights not stuck?
Start to clean all and check from A to Z basic stuff. Can't be anything serious. Serious when you have grey emulsion in stead of oil.

call dodge parts dept give them vin # and they will fax you the schematics for this and you can keep them in your file/ Please rate this response thank you vey much

the yellow blue is the + side of coil but to be safe get a test light connect one end to the negative side of battery or a good clean earth on the engine turn ignition. Check which wire has power .The one with power is for the + side of coil . Check test light on battery to make sure it works