Granted a 347 doesn't make a huge difference alone. But it will give 50-60 HP over a 306. Not to mention you have Stage III TFS heads. A HUGE increase over ported stockers. Not to mention you went up a point in compression.
Im not trying to say your messing anything up. Im just saying, thers plentyore potential in this combo. Definatly a 650 must be running out on top though.
I say 117-118 fully tuned.
Sky
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-1989 Saleen Mustang #406-
TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20.
12.54@107.4 Motor
332RWHP, 350rwtq