A KB block w/ B1 heads is gonna be a pretty serious piece. I'd put some quality, higher end, parts in that build. A good engine shop could put together a "kit" for you, but I doubt you'll find any online mail order kit like that. twocents

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