Bruce, also try swopping engine mounts left to right as well as exhaust manifolds left to right.
This means the exhaust dumps to the front of the motor and you need to fabricate a J-pipe to redirect the exhaust rearward to the system.
ArshCobra did the same with a factory five in the states. see his post here:
http://www.ffcobra.com/ubb/ultimateb.../t/000150.html
Cheers
Les