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sounds like your in the same boat as me... I have a 383 very similar to yours top end wise super victor heads and victor junior intake with an AED (modified holley) 750, 10bolt rear with 4.10's and stock T5 nwc w/t-tops so I weigh a bit more than you. I ran a 12.4 @ 112 spinning hard with a 1.9 60ft. I don't think your car is 500hp probably closer to 425 to the flywheel, mine engine dynoed at 498 but I know all the specifics of the motor with a big cam in it. Good rule of thumb for every .1 you can save in your 60ft equates to about twice that on the top end. so if you were to run a 1.6 60ft you would shave roughly a second off your time, sounds like you have no traction and suspension is your issue.
Those calculators don't take enough into consideration so don't look too far into them for your car to run 11's you would need to be about 10-15mph faster, you have a low 13 high 12sec car there, awesome for the street
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