The LS1 weighs only like 150lbs more than a stock rx7 engine and can easily be made to have a 50/50 weight ratio. The only reason I'd prefer the LS1 over the rotary is maintenance.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15