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The 1995 350 is a "Vortec 5.7" motor if I remember correctly.You will have to get a throttle body and intake manifold for an older 5.7 liter(early 90's?).The Vortec engines are a sequential multiport injection setup(totally different).
1-6-5-4-3-2 number 1 is the front Cyl on drivers side. then it is #3 #5 Passenger side is #2 #4 #6 #1 on distributor cap is the front side of cap next to the hold down screw clockwise side of the screw. Firing order goes clockwise looking down on the distribuater.
You have to put the Ignition Control (IC) system in the bypass mode by disconnecting the "set timing" connector. This is a single wire sealed connector that has a tan with black striped lead. The location of the "set timing" connector with a Powertrain Control Module (PCM) controller is near the PCM connectors in the passenger compartment. Unplug connector (tan/black stripe) start engine set timing to 0 TDC, TURN OFF ENGINE, re-connect timing connector
I HAVE A 93 4.3 VORTEX AND THREE TIMES THIS TRUCK HAS DONE THIS IN 366,000 MILES
THE IGNITION MODULE LUBRICANT INSIDE THE CAP HAS DRIED OUT AND FRIED THE PART. NOW I KEEP A 1/4" LAYER OF THE SILICONE UNDER IT AND I BOUGHT ONE THE FIRST TIME WITH A LIFTIME GUARANTEE. JUST AS THE WIRES. CAN'T HURT TO GIVE IT A LOOK SEE THEY CAN TEST THE MODULE IN THE PARTS STORE