1970 dodge dart setup for street and strip?

My 3 top picks for my street/ strip car was a 383, 400, or a 440. But in my area, big blocks are easier to get ahold of than small blocks. Nice power, maybe not gas mileage but that's not a real good combo. A relative of mine used a diesel turbo on a slant six and it was a fun little car. That is if your dead set on keeping the /6.