I was going to get a T25 from a 200sx, cause it'll fit the RS manifold if you rotate the ex housing and fit adjutable actuator. Injectors will work too then.

How difficult is it to get a decomp plate made up, then welded to the head? Effectively making the head taller, but no need for 2 gaskets. Can't see it being perfect without welding round each oil/waterway though, then machining the holes to right size again.