Only the 8v SOHC heads will fit
The 16v DOHC head will fit too, but the compression ends up totally wrong so pistons need swapping etc etc, not worth the bother.
MK2 GTI 8v head is a good upgrade, bigger ports and a better cam profile really livens them up. Make a new 6degree BTDC mark on your flywheel and time it up to that, the 18degree BTDC mark will be no good for the GTI cam. If you havent already get a haynes mnaual, the procedure is listed there it involves measuring a set ammount and making a new mark with tipex. I used a chunk of ruller with string wrapped round it, so i didnt drop it down the gearbox
While you're there fit the complete GTI 8v exhaust system including the manifold and downpipe (the later stle with 6 bolt joint), I did that on my old driver and it made a massive difference
Only thing with the GTI head is you have the injector holes, you could leave the injectors in or remove the injector inserts and drop pennys down the holes and refit the inserts. I've heard gearbox drain/fill plugs fit too though? Also the driver head has a coolant channel hole for the inlet manifold and carb, but since you're going for dual carbs this isnt required.
