With regard to the big blocks, they use a lot of gas. I've owned a lot of 60's camaros, and muscle-flexing big blocks would get between 5 and 9 mph in a very light car. Living in the country and having to drive, I went to a stroked small block, yielding a 388 ci... (350 with a 400 crank). The car, with that engine, could get me 17mph if I was nice, but would scream when needed, pretty close to the performance of the BB's. I love BB's, but I will never go back. I stongly recommend stroker motors for those who wish to go fast, or pull a load, but want fuel economy also. Just my 2cents.
