Chevy K5 Rock Crawler Burnout

454 bored .30 over, Custom ground Lunati Voodoo advertised Dur. 268 deg, 112 LSA Dome top Pistons, 13:1, 781 GM oval port heads with bigger valves in.t & exh. Flow tech headers. Air gap aluminum intake with dual 425 impco mixers. Dynoed at 455 hp & 510 ft lbs. on Propane. Need to bleed the brakes so they will actually hold the truck, that was with them mashed to the floor.