The 781 heads are good, but BBC is right, they are oval. That is actually a good thing in your case, The rectangular port heads are not beneficial unless you are going to be running high RPM or large cubic inches. I found a little info on the 292. It seems like a fairly well matched cam for your setup. The only down side is that it is a single pattern which is not the best for stock heads. As far as the intake goes, I think a dual plane RPM would match your combonation much better than a tunnel ram. I know people like the look, but as far as a matched combonation, the dual plane is probably best.