Re: GTI swap questions?
The block is the same; it's the internals and the head that differ from those of the Samurai.
If you're looking to swap the whole motor in, including the head, EFI, sensors, computer, etc, be forewarned that this is a pretty major project. There's supposedly a distributor adapter available, otherwise you'll have to remove or relocate your heater and notch your firewall to gain clearance for the distributor. Although this was my original plan, I decided to make the swap much simpler.
Using the entire GTi bottom end (just swapped the Samurai oil pan and pickup tube) I bolted on one of Asian Auto Parts' "Sumo 2" Samurai heads. Of course, my engine is now an interference engine (valves will contact the pistons if my timing belt ever breaks) but it's never caused me any problems. With the torque cam, there's plenty of low-end grunt, yet I regularly rev it up to 9000rpm and beyond. So far, I have about 25,000 miles on it, and it's better in every way than the 8-valve 1600 that my buddy swapped into his Samurai.
If you do a search on this BBS, you'll find quite a bit of discussion about the GTi swap.