if it was me, I'd use either the 120Y BorgWarner 3.89:1 ratio and the same width as the H150 in the coupes , or a Corolla BorgWarner available in 3.89, 4.1, or 4.3:1 ratios and approx 3" wider, which will match the track on the front after you do a strut swap to Stanza or similar. They are strong enough for a top bhp L series and cheap as chips. And they are a bolt in proposition.

You will need the tailshaft from the donor car too (different flange on the BW), and if you use the Corolla diff, you'll need to swap the flange over from a 120Y BW diff, and get the Toyota wheel nuts too (different thread pitch). Handbrake wil require a bit of fiddling around for the Toyota diff.