I think the rear may be more effort than it's worth. The galant/1G rear brakes use a caliper that has an integral parking brake. The 3000gt rear calipers do not. They have miniature drum brake inside the hat of the rotor that is engaged by the parking brake. I'm not saying it can't be done, just maybe the wow factor doesn't make it worth it. However, the front will atleast need custom brackets to mount the calipers, and a five lug conversion. You'll need bigger wheels to clear it all, and remember to get hubs from an abs equipped 1G if you want that to work after you're done.
