A 6.2L or 6.5L chevy diesel will bolt right up to your frame and would likely work with what ever transmission you have in there, if not a transmission would be very easy to find and be fairly cheap.
You can get a BT4, but how economical is a $4000 engine that will require a lot of fabrication work to get it to fit. And good luck finding a transmission (and you will need a custom length drive shaft too)
If I can get mid 20s with a 6.2L in my suburban than a 57 should get closer to 30.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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