for 4g63t vr4/evo1-3 use back the perdana 4g63sohc mounting; if want 4WD use eterna rear diffs and shafts, and a custom long shaft (donno if the standard eterna ones will fit)
6A12 has SOHC, DOHC, Twin turbo, MIVEC and MIVEC MD variants. for the mivec find the one that looks similar to the perdana V6 engine (gearbox on driver side) and not the FTO or the later Galants version (gearbox on passenger side) then the engine mounts is the same.