interesting concept, but i dont know quite how feasible it is.... the thing with both the capri and the celeste is that they are both Rear wheel drive cars, so dropping in the drivetrain of the front drive-to-4WD Evo is probably not going to be possible without some major structural work... on the other hand, dropping in the engine might be a possibility (however, here too you'd have to consider that in the evo, the engine is mounted transversly, but naturally in a RWD car it'd be mounted longtitudaly).
a rather more feasible idea for a Capri is to get down some sort of old V8 (chevy or ford second hand from the US or Aus, or even the old rover v8..... could possibly find one in SL that has been chucked out of a diesel converted Range rover).... sort the brakes and suspension.... and voila! your very own drift machine....