im pretty sure the old one ones will fit but you might want to double cheack with chevy...or at least google lol

i would go one a 4hweeling site and talk to some of them, i am thinking it will, but if the tailhousing on the transmission is longer than the th350 you are gonna need to get the front extended and the rear shortened. hope this helps ya on your project, good luck.

there is a web stie called www.73-87chevytrucks.com go there and ask any quesstion you want, plenty of knowledgable guys there

as long as both the 203s are the same they will work, there was a couple different types of 203s made with different housings