Will be 2 bolt main most likely. 9.5:1 compression. The intakes are VERY restrictive on those motors. They run out of steam at 5 grand. Good low end torque though. If you go thsi route get a MAF style TPI 350 HO. Will have the better cam in it. If a 305 tpi is marginally cheaper go that route. You won't be gaining anything injector wise and maybe a 20hp difference. The 305 makes good power. Get the dual cat setup off one also for a little extra hp (gut it). Injectors will obviously have to be replaced cause the 350 is only 21lbs. You can do little tweaks to the plenum, runners, bigger TB, or do the porting on the TB. There's power to be had just cleaning up those things. The intake is the dead horse of the TPI though. Heads are thin castings also if I remember right. You can use regular v belt or serp, they came with both. I think they went to serp in 87 from what I've read but I looked at an iroc once with a 305 and it still had v belt. I have retarded vast knowledge on these cars so if you have any questions just ask. The bottom end and stock injectors have been known to hold 400hp but I wouldn't try it 
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87 WE4-factory radio delete, pwr windows, rear defrost, pwr antenna, that's it! Runs on used parts  and stuff I found in my uncles back yard. Now that it runs I'm tearing it apart 
...and a 93 T/A- Well optioned but definitely not a whole lot of Pontiac Excitement there.
soon to be joining in- 88 shelby z 5 spd 2.2 intercooled w/ttops 
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