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Well it is a street car that goes to the track D.O.T. tires full exhaust air cleaner even a kick butt sound system just think there is some more in it, thinking heads and carb should get me 10.30 - 10.40

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Well, you posted 1.46/1.48 60ft. times. That's kind of soft for the engine combo. More carb and ported heads might even make those 60,fts slower.

But even with that said, those EZ heads OOTB arent that great, so yes have them ported.

It seems you have the budget for the 512, so YES Id go ahead and do that too. But , I say NO on the 12.5 comp.512 motor, if you do that you've just "lost" your Street car combo. Keep it around 10.5/11.0 max and enjoy pump gas.

Further, that cam you have now will be better suited for the 512 vs the 470.

That 470 is a good motor, if your going to stick with it. Change the cam and port the EZheads and swap carbs. @ 3700# your ride isn't running to bad, but she does have more in her.

With a 1.46/1.48 your running what, about a 10.75 to 10.9 ET If your ET,s are faster then that, your actually running pretty good with that motor at 3700# Maybe you need more Vert.

Id say just go with the 512, more streetable at a 10.5 comp, and plus you know you Want one.