I've got a 2.8 gear box in my mk2,i had the input shaft changed for one the right lengh and used an uprated pinto clutch,the 2.8 one is to big,the capri prop aint no good either,to long,u want one of a rs2000 or of a auto escort or buy a single piece one,about £100ish new.
Hope this helps.

Cheers Mick.