Im using with blacktop zetec so only reason i bought gearbox was for rear starter lol.

Turns out it was a smart move as i have decent IB5 with group n fiesta st gear kit and turbo diff. I've yet to put it all together like... Clutch choice is still same yer, the bellhousing looks identical on mine. Webs are different shape but the actual outline is same.

I might get the gears shot peened too then just for reliability. depends on price.

Is there any chance the gearbox will make the right side of engine sit a cm or two higher when fitted to blacktop in mk4 on original bc brackets and mounts?

It's either that or engine mount is sitting low, but i used original hole when i modified the bracket, and there doesnt seem to be any movement in it.