I almost didn't post here due to some of the idiotic comments.

I have a 360 in my '75 Powerwagon and it will run circles around the 318 that was in thefe before. Many things can make an engine not perform up to it's potential, including low compression, cam that is not degreed when installed, poor selection of parts, etc.

I've also done the 360 head swap on a 71 318. Engine was sloppy worn, low compression, stock bottom end, stock 1.88 valve heads. Nothing more than a mild cam and headers on the engine and it would run 14's at 95 mph in a 3500 lbs.car with 3.23 gears!

Attention to detail is what gets you there. No reason why either combo should not perform!