I agree with Roscoe on using a small block. The weight and placement of the engine in this small of a car, and the way it then handles is an issue to consider. The first time I got caught in the rain in my car (with a SB 302) it was a whole new experience on how the vehicle handled. I was driving real cautious until I got back into the garage!
This is America, do what you want, just my .02.
Regards