Re: 305...powerful enough?
Junk the 305. It's a piece of crap. 350's are a dime a dozen, for a little more, you can get a 383. Mounds of torque. Smoke the tires all day long. As far as your compression ratio, for a street motor, I'd get it down to 9-1, but I wouldn't run over without aluminum heads. For a truck motor, I would get a mild maybe 300hp 350, and put the big gears in it. If you really want the balls, go to a 454 or 502.