Dammit.
With all the turbo goodies you've got for that rotory, you thing you could break even selling it all and picking up an LS1? I've always loved RX-7's, but I'm scared off by the finicky turbo rotory motors. A Vette motor in there would be a beast, and a way more reliable. Plus I hear the handling isn't effected all that much because the 350's weight distribution isn't all that much different than the rotory, aside from the CG being a bit higher.
What's a kit LS1 go for these days? These guys are known to be overpriced, and they've got a new LS1/LS6 w/ 390hp for $7500:
http://turnkeyenginesupply.com/street_57390.htm
I gotta figure with some hunting around you could be at the 400hp level for $5k.