There really isn't much in the area of a power difference. Fact is, many companies design they're cast iron and aluminum heads slightly differently. Even if they have the same name. For instance, the FMS GT-40 iron heads are at a disadvantage to the GT-40 aluminum heads due to revised ports and whatnot on the aluminums. The biggest differences is that aluminum disapates heat faster and weighs considerably less than iron.
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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s
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