As far as the HP blocks go, if you're skeptical, I'd wait until he had them in stock and ready to ship before committing. He said they should have a good supply by the middle of the year. I have zero experience w/ them, I just got curious this morning and gave them a call. 
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
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