Looks as though the floor hump has been replaced with a larger version - no floor cover panel over the transmission. The hole for the gear stick seems too far back for a standard 3 speed looks as if it would be under the bench seat (if it had one).
I'm starting to think this is an abandoned project and no motor has been fitted to the replaced front end - tell tale signs include a very bodggy brake set up - rubber hose between the master cylinder hooked onto the old brake line, no reinforcement around the gear shifter hole.
Anyway we still reckon it is a good starting point - we will lift the engine back out this weekend (could not be bothered yesterday so put a brick across the front end to keep it off the steering and pushed her back into the shed - first slant red I've seen
) and start from scratch. Mount a bare block with the gearbox and then set up a custom X-member as predicted by Glenn.
I'll take some pics and then ask heaps more questions.