we put a 4BT in a scout as a school project for a customer it went in nice but since the 4bt is normally used to power generator and run at one rpm it lacks a lot in power! the 6bt 12v is the way i would go but with any custom engine swap your going to be spending a lot of time and money to make it work plus your going to need a welder and a lot of tools

 

4bt would be close to the cheapest and an easier install. You can get an adapter for a NV4500. Check out www.4btswaps.com You could the motor out of a old bread/ delivery truck or a Kabota tractor. 12v would be more fab work, more weight. 6.0 would be the hardest and most expensive.

 

mines a 6bt, getrag g360, i bought a 91.5 d250 for 1900, used everything from it, only thing i had to buy were new stock first gen dodge motor mounts, and an 8 dollar part to fix the getrag. used the dodge slip yoke from the 2 piece shaft and made it into a one piece since the g360 uses a fixed yoke, i used the dodge exhaust and some driveline tubing to make my exhaust. imo a 6bt is alot easier to find that a 4bt, of course a 4bt would be more practical if you had one, but since they never put them in a production pickup they wont come with everything you need. I plan on an nv 4500 eventually, as i have 90% of one in buckets in my garage, but i dont tow anything and the g360 works fine if you treat it right.

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if you have a welder, a tortch and a chop saw you can do it, although a forklift helps. I managed to get away with mine without drilling a single holeI never have a decent drill bit...