360 driver build
If I can get 15-16 mpg with a warmed up 340 w/head work/.528 cam/750 dp/3.73/4spd
then you can get 20 mpg.
I bet I could stick a 600 on it, squeeze 2-4* degrees more with a vac adv can, stick 3.55's in it and 20 mpg, as long as I could get about 2800-3k cruise, no problem, right now I'm cruising 3200-3400.
jUst an example