i have a 98 camaro ss. Do i need the large diamiter bolts holes or the smaller one for my th400 to bolt up on my flywheel?

 

Your '98 Camaro should have the dual bolt pattern on your flexplate (autos don't have flywheels). The TH400 converter should bolt right up, be sure to check for proper engagement to the crank hub. You might need a spacer, or you can opt to have a special converter made up for you.

 

Thanks, thats what I needed to know.