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FWIW.....
I have a 6.2na in a 86 M1031 and a 6.5 turbo in a 99 Suburban.
A Durmax is a much better engine.
A Durmax LML with a 6l90 or better yet a 8L90 in the M1031 is what I would like.
Would make the M1031 a sleeper.
Regards
Joseph
Found the following;
"gm square body duramax diesel engine conversion '73-'87 C & K SERIES......"
Looks like simple swap and bolt and to me it does not look expensive{the conversion parts/kit] compaired to fabricating everything yourself...