I'd certainly agree with the TFS TW heads being the best aluminum head for your money, and the street, on the market.
Great flow, down low, right to the top. Pretty small combustion chambers, runner size that match's well to a worked 5.0 or bigger.
I've seen them as cheap as $900/set.
As far as once they are ported and maxxed out, that's another story between the iron's and the p's. I would assume you could hog them both out and put bigger valves in the P's, not sure what it all winds up being at max. I think if all that work is going to be done, most stangers would be better off picking up a set of the TFS TW heads. Were talking a killer flow curve, and a max flow of above 240cfm, stock! Even wigged GT-40, or GT-40p's would be hard pressed to match (If they even could). I saw a set of milled ported GT40P's on Ebay go for $500, brand spanking new. Complete. There are a couple sets of used GT-40 irons on there for around $400 right now I think.
If I were to go with forced induction, I'd take the GT-40 iron and it's 65.5cc combustion chamber. That size keeps the CR a little lower. When you are running an iron head, keeping the CR lower can pay dividends in reliability, and longevity.
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