i meant you could unbolt anything you have connected to your old engine, (exhaust, filter etc) and then drop a new engine in, and reconnect it it all back up, and you might be able to re-use the ECU so the map would remain on the car, if that makes more sense?
Best mods for engine out would be imho, clean and paint the block, clutch + flywheel, clean intake manifold, CAI, (remove snowscreen), drill and smooth the filter box, and clean and polish all the engine bay, and ancilary units such as the header tank, pump's etc, and if you could, replace all the OEM pipes with uprated silicone pipes. You could even look into fabricating a FMIC?
And possibly upgrade the brakes while its off the road at the same time, paint the calipers properly etc
Thats what I would do anyway