I'm not quite seeing the whole necessity for the aluminum heads except for availability and even at that many will say that they need to be reworked anyways. For your intent and purposes previously stated I can't see were aluminum heads are going to help that much if any. Now if you were saying that you're going to drag race that may be a different story. Hughes is a very good source of information and they're helpful when you call them but please always keep in mind they are out to make money. I have a set of their rockers and they're great and they offered plenty of tech support. But at the end of the day they're trying to make money and some of their tech support was a little misleading and quite honestly it seems a little off the cuff and definitely some of it was flat-out wrong and I must add mostly due to the fact that they weren't there seeing my problem but we're trying to give me a quick answer it seemed. again great product but...