Are out of the box stock EdelBrock Performer RPM 6077 heads able to be ported? Or are they better left alone? I have a moderately built 360 and I have the build info if needed. If the heads can be worked further, about how much more in hp could one reasonably expect from mild to heavy porting alone? Thanks.......

most OOTB flow numbers I've seen have been ~240CFM...max ported they're good for 285-290 CFM, which would yield theoretically, if the rest of the combo is maxed out, another 90-100HP

You will usely see around 50+ horse with a set of fully ported heads and matching intake. If the head porter is really good he will be able to get the low lift numbers really flow. The low lift #'s are what get the car to move off the line, and the high lift numbers will pull the car down the track faster than your aponit. So i recommend you have the heads ported.

Flow numbers can be found here:

http://www.shadydellspeedshop.com/