What is the true on the car Loaded effective diameter of your 31" tall tires.???
measured loaded radius x 2 measured from the ground to the axle center.
What is the true vehicle+ driver weight. take it and scale it, with your fat *** in the seat.
local scrap dealer, junk yard, truck yard, hiway truck scale.
your planed 383 engine combo so far will make an honest 440 to 460hp on a real engine dyno.
Its a good runner for sure but not 500hp.
If you want it dynoed,bring it down here and we can get it dynoed. (engine dyno, chassis dyno or both, your choice)
you just have to pay the dyno session bill.