You should never set your timing by ear. It can be very taxing on your engine. Also, as stated above, your engine is still pretty much stock with a few bolt ons. If I had a 331 stroker and you beat me, I would drive straight to the SOB that built my motor and slap him. I would be willing to bet that the heads are bare, for that price. They would be an improvement over what you have, but I hear the gt40p heads are a pain. You need special headers to get to the plugs.
Have you ever run it in the 1/4" If so, what does it run?
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'90 GT Under construction
Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!!  
04 F-150 STX 4.2L 5 spd
Rice Haters Club Member #128
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