I have a 72 cutlass convertible and I'm going to be taking out the 350/350 and replacing it with a 455/400. Does anyone know how much I need my drive shaft shortened?
The 455 combo came out of a 1970 Delta.

Thank you

 

what rear end do you have? also, is the TH 400 a long tailshaft?

 

I have a 10 bolt.
Yes. The tranny has a long tail shaft.