Ok so Jay allen ran that 11.19 at 120, and im sure he changed a ton of parts and had quite a bit of tuning into the car to get it to run that well, if the average guy tried to do that, by the time he got done with all the testing and swapping parts he could have just put a set of aluminum heads on the car to begin with and he would have probly spent less money. Im not saying what he did was BS but thats the hard way of doing things.
They just went 10.90s in factory stock, they run E7's in that class should i put e7's pn my car and hope it runs faster, nopppe, its not a fair comparison to compare race parts to street stuff, if the OP bolts gt40 heads on his 347 can you tell me with a straight face that its going to run low 11's? Thats a bet i'd put money on, and nobody said $3000 dollar heads, he could sell those GT40's and get a used set of trick flows for cheaper and be ahead of the game.
Why take the hard way iff you dont have to?