Need help identifying 11" flywheel

Daves69 said
I'm thinking '68-'69 440 B-body.

Yup. Add HP 383 to that list. The clutches for 70 / later were the "scalloped" design and used what amounts to a 10 1/2" bolt pattern. There are variously called 11", 10 7/8, 10.9, etc etc. and for the one I had a giant PITA