I have not seen one yet, but I think I would like a Detroit Diesel 12V53 with two or perhaps 4 turbos.
Then to make it even better it would be a silver model (bypas blower and crosshead pistons) and also DDEC (electronic controls / injectors)

They did actually make a few V12 series 53 Detroits, but less than 20 I believe.

More practicaly I would like a silver, electronic, 4-53TI
Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-