The way block availability is now, I think the conversion kit is a viable option. If I was in the market, I'd definitely be looking into it.
Anyone remember Steve Magnante's (from Hot Rod magazine, B-J Auction, etc.) red hemi dart? That was a Stage V conversion on a 440 block if I'm not mistaken.
Lets be honest here...most people building a hemi aren't looking to make block breaking power. Less than 600 hp is what most seem to be after and a stock block will last a long time doing that. Why build a Hemi If your looking for 600 or less  While I agree w/ your thinking (mine makes 4 digit HP), there are a lot of car show and cruiser guys that just want the look. Or have just always wanted a hemi. Back when they were available, I bet the "little" 465 hp crate hemis outsold the 600+ hp 528" crates 10 to one.
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
| 
