This question came up a few weeks ago when I was taling to a guy who is trying to be the fastest hpcr with only boxes. I know my 15. 182@89 has to be near the top weighting 6800lbs. And Ive laid down 306hp on dave dunbars dyno. Or for that matter the fastest 12v w/o injectors, turbo mods, or more than minor tweking on the pump.