440 Source big block aluminum heads

Has anybody bought a pair of these? I'm looking for a reasonably priced set of heads I can experiment with and take a grinder to, kind of go crazy on them without breaking the bank. I realize that they will never compare to an Indy or B1-Bs but the price is right and i'm a hands on do it myself bracket racer. The 906's on my car flow 290 after extensive port work and they work well but are fragile. If I could get a pair of the aluminum heads up to the 320-330 range I would be happy.