Slightly off topic -- isnt the V10 a 477ci?
Definitley a hood height problem there, as it doesnt have the body height of a pickup. As far as the transmission, you could always do a custom G56 or NV5600 swap, with a custom shifter, or even upgrade the strock T56 from the viper. Weightwise i beleive the cummins is a lil bit heaver than the V10 -- im thinking maybe 200lbs. The D60 would be fine i beleive if set up properly, but the halfshafts might not live up to the shock of cummins low-end.
Just my . 02
Jake