New owner of a 1976 Plymouth Duster

My name is Joe and I'm in Windsor, ON, Canada. I recieved the car as a gift from my wife. Best wife in the world. :) The car needs quite a bit of work. The body is solid but needs a drivetrain. Currently sitting between the fenders is a 318 with 904 and a small pumpkin. I'm still trying to decide what to build for it.

I'm not sure how these cars ride with a big block 440 or a small block 360?

I'm looking to build the car for street use with some drag runs once and a while.

I'm thinking 360, 727 with an 8 3/4" or 9".

Riddler