i looked into it because I had the 4g64 in my spyder. I swapped to a 4g63 but I know that the 2g and 1g head bolt up to the block with alittle modding. You can try this page for getting that to work out...
http://4g64.150m.com/turbo.html . You would have to obviously build the block up because it would only handle 10psi or so without doing so but if you did end up doing this you'd have a nice torque machine.
P.S I have a 4g64 engine still for sale if you were looking for one