It'll be simple enough provided your mk2 is a late one (same f/b as mk3). As said, I'd hold out for the abf myself, youl be bored of a 2.0 8v the second you turn the key.. I've gone from 1.3 to 9a, then abf, then I've changed gearbox to 02a, each time taking the engine out. I'm obviously faster now with no labelling up etc and knowing the setup more, so suppose its not the worse case doin things twice, but going back I'd have done the full abf + 02a + all new main engine+gearbox seals, etc etc in 1 go, just to save the misery of doing it all again. Still, what's a couple of hours/days work for the many many hours of joy you'll have with it abf'd.