Head Porting question

I have weighed all of the pros and cons of porting the heads and I have contacted a machine shop down the road and he said that magnum heads are the only way to go and that he would help me out with doing a valve job on the cheap if I could find a set. This guy works out of his shop at home and doesn't even advertise. After calling about 5 wrecking yards I found two sets that I could pull for $75 per set. I think I will pick up both sets and do some trading. Thanks guys.