MM&FF's new issue attacks just such an issue. They run a 306 against a 347 carbed combo and dyno'ed them. All told, the 347 ran about 60hp better. With that being said, it depends on the design of the kit as to how well it'll run. All things being equal the 347 should run noticably harder. Although, 306s are cheaper for the more budget minded. And if you can make a 306 run as good or better than a 347, you've got that little added bit of respect. Personally, I'd do a 331. More power than a 306 but better rod/stroke ratio for increased longevity.
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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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