From what I've seen, I don't think there's that much price difference b/t the two right now. Especially since you're building the conversion motor w/ a cheap 440 block...since any new aftermarket hemi block is going for 5k to almost 9k right now.
The biggest downside is resale...no one is gonna pony up decent money for a "conversion motor".
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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