You did not give us enough information. What year is it, how many miles, what engine does not work. I seriously doubt you can refit with a Cummins 450 without extensive modification, including the transmission and differential, and cost. $20k is unrealistic and I would seriously consider replacing the bad engine with a rebuild just like it.
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2001 Newell #579
tow a 2011 Honda Odyssey
1935 Mercedes 500K replica
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