trans, I believe RUG-M & M1 is for '67, M2 is '68, M3 is '69.
Crank pulley 6321-B is '68 390GT 1 belt standard application
Intake C6AE-9425-H '66-67 428 PI Aluminum dual plane intake. Believe the correct should be either C7AE-9425-E '66/67 390GT cast iron used from 11/1/66 - 9/17/67 or C7AE-9425-J 390GT cast iron from 9/17/67.
This info is from my casting guide book. I use as a guide ONLY, may not always be 100% correct.
If you borrow a tool more than twice, you need to own it
You get what you pay for!
George email: <firstname.lastname@example.org>