http://v8rx7.com/
thats a pretty decent site I stumbled upon
I've seen some discussions of V8's in FB's being insane overkill in power, but I dunno and if you feel like getting everywhere fast and probably sideways go do it lol
I say if the 12A is still functional keep it till she blows, so its still an
RX-7, most people go with LT1's and other vette motors, they seem to fit well or whatever, but if you decide to do it anyway, GL, and take many pictures along the way