10s N/A ?
The 383 can make 550 HP on pump gas, so with a 427 you are looking at 600 or so depending on all the goodies and guessing by the 4/7 swap cam it is taking advantage of every possible hint of power.
Good luck on finding a 8.5 to fit the car. Unless you go ladder bars and coil overs. You can buy 12 bolts to bolt in.







