I have a '73 GMC pickup and I'm installing a 5.7 TPI out of an '88 IROC. I need to know Which flexplate to use with my Turbo 350 that came in the pickup. I know it's not exactly a ThirdGen question but my donor came out of one, and I do have a 91 Z28 as well. Thanks for the help.

 

If your starter in the pickup has mounting bolt holes directly left & right of each other, use an 86-97 V8 F-body flexplate (153 teeth)

If the bolt holes are diagonal from each other, use a flexplate for an '86 & newer GMC 5.7L gas pickup(168t)