Drivetrain :Np 435 with divorced 205 and stock gears and axles.
Transmission :no info
The 390 is having a a hard time turning 37's despite the fact that is mild built with headers. So a power house transplant is in order. A spare 460 sittin around the shop went down to the machine shop. A 4.3 crank and punched out .30 over got me the 521. Lookin for lots of low ends grunt for steep grades towing 17k or more.