New guy - 68 Notch-back - 900 mile road trip!

Ok....I measured the bolt patterns.
Rear - 4.0"
Front - 4 1/2"

The rear end is probably the original from when it had a slant -6

And, upon the good advice here, I'm going to stick with a small block.

But - I want an overdrive. What's the hot ticket in Mopar 4 speed automatic ovedrives?

:cheers: