I'm running a 512 in my 'cuda. I'm restricting power as I built the engine combo for our local track series where streetcars are limited to 11.00et's.but on a prepped track it'll go 10.5's. I have 325x50 ET Street R's on a 8 3/4 4.3 geared Detroit locker with old school SS springs & old Comp Eng 3 way adj shocks.. It puts 645 HP to the rear wheels, runs 1.5 60 fts & usually tops out at 125 mph..