New owner of a 1976 Plymouth Duster

Would it be better than to use the 318 I have to bore it out to 340 spec. Add a cam, heads and then use the 904 I have?

OR I can get a 360 with 727 attached already and build that. I'm leaning towards getting the 360 with 727.

I guess drivetrain is going to require alot of reading to see what I can do. MY main goal is to get the car disassembled and then do the suspension and chassis stiffening.

Riddler