My 88 trans am had the stock tpi 350 with a two piece rear main seal. I need to drop in the SDPC LM1 350 (pre 86) engine for about a year but it has a one piece rear main seal.what do i need two do to make it bolt up and work with my 700r4 trans do i need a new fly wheel or flex plate and will every thing else from my stock motor bolt up to it. IM going to put on set of TFS aluminum heads and a cam in about a month i just need the car working to get to my new job...

 

I think you have some things backwards here. The '88 engine should be a one-piece rear main seal, while '86-older would be two-piece. The only concern would be the flex plate. Just get one to match the engine.

Also, '88's had the center two intake bolts on each side at a different angle than the other intake bolts. Make sure you specify that when you order your heads.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.