There was a member here a few years ago that had a 600+ inch B1 headed motor built by MM. It was a high effort pump gas street/strip type build, made 1k+ hp IIRC, and he had a LOT of problems w/ it. MM was no help w/ it either. I don't think it even made it to the track.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax