[Dark_5.0]

Untouched GT-40 heads will give you quite a bit more H.P. than ported E7's.

1. They have larger valves
2. I seen a guy with a set of GT-40's with a stage 3 port and polish job, He knocked off a second in the 1/4 mile over his ported E7's.

So in my opinion these heads are good right out the box and they can be worked over to produce awesome amounts of power.

320+crank H.P. should be no problem with the right set-up. And in the future if you want more power (and you will) get a nice port and polish job.

Good luck,