You wanna check out the Beta 60, a marinized kubota engine. Its a bulletproof diesel with parts available everywhere. It’s motor mounts will fit our beds and is configured to be put in backwards. You don’t want to buy a new transmission as ours is the best but will you need an adaptor plate. I prefer this engine due to the low operating RPM’s vs the Yanmar’s and affordability of parts vs Volvo-Penta. Good luck finding a bad review on it.