The Sunny probably isn't registered is it? I'd second the idea of keeping the Sunny L series & using it to drive to Uni in. There's more room in the Sunny, they are usually quieter (depends on the exhaust), & aren't much bigger on the outside than the ute, compared to a commodore or falcon.More room in the back seat, too. Might be best to see an engineer about what is needed with it, could be minimal. You could then get a 3.7:1 diff ratio for the ute (from a Japanese Stanza manual or a Bluebird series 1 4 speed), plus either a Nissan 5 speed or a Toyota box with an aftermarket bellhousing & maybe an A14 or A15 in the engine bay. You'd have the time to look for these things, as they aren't easy to come by.

Good luck whatever way you go, & remember to keep those photos coming.