alright i have an 86 fc i took the stock exhaust off and found it had a cat delete for the stock manifold...can i use this on my 82 fb? looks like it would work but i thought i'd ask to make sure.. heres a picture.

 

I suspect the outbound flanges are different, both in diameter and bolt patterns. Then there's the question of what to do with the split air piping. By the time you're done modding the FC piping to fit you're 12A, it will have been easier to install headers.

 

true i guess i'll just save up for a header then, it was just an idea since i had it laying around oh well! Thanks for replying.