440 Source big block aluminum heads

I just had my fingers in a set of the "source" Stealth heads for the second or third time ? I forget, just never paid much attention to them ? they were Customer supplied for a 438 street engine.
IMO
Pretty straight forward and "simple" Head, as it should be for the Price, Price being the keyword in regards to R & D ?
I did not Flow them, can't see the point, but I suspect, probably, that the law of "diminishing returns" of Flow Gains to Dollars spent would very quickly stack up, in what is a VERY WELL designed, and TRUE to it's design parameters, a "Street" Head.

Again IMO,
The Stealths with "Minor"work, are Head and Heels above any Iron Head, but just be careful NOT to get upside down, trying to make a RACE Head out of them ?
I would suggest, Budgetary, they only be considered up to 600hp on smaller engines with limited "expandibility" ? 550-600hp 451 combo's ?