62 six cylinder to 73 six cylinder

Changing the 62 six and replacing with 73 six I heard somewhere before that i will need to change something on the crank.That the later 6 would not match up to the earlier trans.What do i need to change?

the pilot holes are different sizes and youll need a bushing as the earlier pilot holes were smaller. if youre using the original trans.

Forgot to add it's a auto pushbutton