Gas - easy, crate Chevy small block
Diesel - I'd go with the R2.8, which is basically designed for repowering Jeeps and Cruisers, it's what Profits uses:
Not all engines are crated equally. When critical components such as fuel pumps, filters, accessories, starters, and flywheels aren’t included in an engine package, you have to piece together these components from various manufacturers, hoping for the best. For the vehicle specific components...
www.cummins.com
Power numbers and weight generally in-line with the OEM Toyota stuff
I'd pick Gas / Petrol if it were me. I always wanted to do a 5VZ (3.4 out of the older Tacomas) with the OEM 5 speed in a cruiser....I know some of the S America LC's used that engine.