Umm... hate to point this out guys, but he's running 1.7:1 roller rockers on that B303.
.510/.510 and 224*/224* duration is more than enough cam to make plenty of top end power. There is nothing wrong with the cam. If I'm correct, the GT-40P crate engine is rated at 320hp with a B303.
You're about 30-40hp short of where you should be. 255rwhp = about 310 at the crank. You should make around 340-350 at the crank with your combo, which would be around 280-290rwhp. If you bumped the CR, switched to a 76mm MAF, a 70mm T/B, and got a different intake, you might be able to see your 340rwhp, but that's about 410 at the crank. 410hp N/A with an EFI 306 is a pretty tall call, but with 10.5:1 you might be able to pull it off.
With TFS TW heads, the last intake test I heard about had the Holley absolutely trouncing the other intakes. I would certainly recommend it for max power on your combo.
Was the Dynojet equipped with a load bearing device? If not, forget about the correction factors. They aren't whats messing with you. In fact, the dyno may not have any adjustable correction factors depending on the model.
You know you have a misfire, and obviously that's top order. Hey, exgmguy, weren't your heads older model TFS's before the change over?
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