Possible 4-Port N/A Start?

[infernosg]

So for the longest time I've wanted to do a 4-port N/A build on my '89 GXL. I've found an engine locally for a good price that may be a good candidate, but I'm not sure. It's a '88 TII engine w/ 100k miles on it. I'm told it holds compression but the coolant seals are gone. I'm really only interested in the housings as my plan consists of swapping in a S5 front cover, RX-8 e-shaft and some S5 N/A rotors (RX-8 rotors would be nice, but I've heard there are timing issues?). Ultimate plan would be a streetported or bridgeported motor with ITB's and being controlled by a PS1000 or Sprint RE.

I'm just curious if I should be weary of the coolant seal failure even though I will be rebuilding the engine from the ground up. Also, are there other incompatabilities between S4 motors and the S5 chassis I should be aware of?