New to Mopar and 1968 vert

Hello
This is my first A body Mopar, been stuck in the Ford lane most of the time.
I'm very excited to get started on my 68 vert.
It's a factory 6v car but a big block K member has been put in car.
It came with a 68 383 4 speed. Rebuilt but not assembled.
Long story ... But i have a new 1970 440 I'm going to drop into it. Not sure if I'm going auto or 4 speed yet. I have both ready to go.
I'm sure I'm going to have plenty of questions if y'all don't mind answering newbie questions.