I imagine the new owner's will put out a better product.
But since it looks like you have pulled your old "500hp" hemi, just have it upgraded (rebuilt with more HP in mind).
That should save you lots of money using your block, heads, rockers, intake, etc.  Should save you a ton of money just upgrading what you have already. Having your heads ported, a new cam, and possibly an intake/carb change can get you 100+ hp easily depending on what you have already.
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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