389/421 interchangeability
 

Going to put a 1964 421 in a 64 GTO I'm restoring. Plan is to remove 389 (original to car), rebuild it, and set it aside. Put the 421 in its place. I only have a bare block and crank for the 421, so can anyone tell me what parts from the 389 can be used? I know about the larger items, heads, intake, but what about dist, alt bracket, ac unit, fan, waterpump, balancer and pullies?

Thanks in advance!!!

Everything will interchange.

Just like in 1964!!!

woohoo!!!!!!!!!
Thank you gentlemen!

Hey B-Man, you ever get your 421 up and running?

Ran perfectly on the test stand.

Not in the car yet, my air-cooled hobby cars have had the bulk of my attention for the past few years.

Make sure yours is drilled for a starter in the block. As I understand it '64 was a transition year for the 421 going from a bell housing mounted starter to a block mounted starter.