Heads issue

Here's my dilemma, guys.
I'm (re)building the 340 in my Duster (for the second time). In the original build, when the motor was torn down we found TRW 13:1 pistons in there with 1.88 J heads. The engine shop decided (correctly so) that this was wayyy too much compression for a street motor, and cc'd the J heads our to somewhere around 72 cc's (I think) to bring actual CR down to around 11:1...which is good. We kept the 1.88 valves. I'm in the process of doing the motor again now. I've read a lot about the Edelbrock Performer heads and would love to slap a set on, but not if I'd have to have them hogged out. So, my question is, can a set of ported J heads be massaged to make them perform to the level of the Edelbrocks? And if so, what will I have to do to them? They've previously been ported, polished and cc'd and have a 5 angle valve job. I have not sent them to the builder yet.