You may want to keep the harness, I did just in case an am now wondering if it would have been easier just to use the Ford harness as I am having some wiring issues w/ the injector pump. You'll want to use the Ranger flywheel, and you can either find a good clutch shop that will come up with a pressure plate for what you need, or drill and tap the Ford flywheel for the Mitsu pressure plate like 89Diesel did. This will allow you to use the Ranger diesel starter.

85 4x4 Pickup, 267K, 4d55 Conversion, Sway-A-Ways, Dual Batteries