If you are head limited the engine will make the same power at 5% less rpm. So if it's 7500 with the 3.79, then it's 7100 with the four incher. If the heads aren't the limiting factor then you'll make 5% more power with the longer stroke.

Build the biggest shortblock you can afford.

There's a quote from Larry Widmer that goes something like this, "RPM means ruins people's motors."

R.