Engine compatible i was wondering if 1jz twin turbo or 2jz twin turbo would fit on 1987 toyota supra? if it does, do i need any modify engine brackets? please help.....thanks

A tuning shop is a good idea. They would be equipped to test everything out. And they should know of any modifications you may have overlooked. At least talk to them.

Check for crushed/shorted wires.
Check part numbers to verify model compatibility.
If to no avail install aftermarket tachometer and turbo boost gauges.

motor shot

yes the tranny will work and you need the 1j engine mounts as they are different. the 7mgte mounts will not allow the exhaust manifold to fit with the down pipe. your intercooler will work fine although i recommend replacement since you loose pressure if this is an original unit. hope this helps. please rate.

you will need an additional turbo manifold. I have the correct one its for sale right now on eaby. The ct26 turbo manifold does not allow for proper mounting. I can include directions with the manifold

1987 non-turbo: 10 deg Before Top Dead Center (BTDC) @700 rpm
1987 Turbo: 10 deg BTDC @650 rpm.

To set the timing, you will need to connect a jumper wire between terminals E1 and TE1 on the diagnostic terminal. This diagnostic terminal is located just aft of the engine compartment fuse box. It is a black plastic box marked "diagnostic" on the cover, which flips open to reveal the terminals inside. There is a diagram on the inside of the cover which explains the terminal positions. On the Turbo model, you need to remove the forward section of the engine cover to gain access to the number one spark plug wire.

Shims and Valve clearance cold : 0.15-0.25mm (in)
0.25 0.35mm (ex)

You should be able to use a 2jz serpentine belt from a MKIV Toyota Supra.

https://tech2motorsports.com/products.php?p=40

There is no 3c engine in a Toyota Supra. If you have a 1995 it would have a 1JZ-GE, 1JZ-GTE, 2JZ-GE, or 2JZ-GTE if you can tell me which engine you have I can further assist you.

Yes the heads are interchangable. Best way to find out if stuff is interchangable is to go to Toyota dealer and compare part #'s