Cummins Turbo Diesel in a A-body??

Thanks Southernman! Yeah, i've researched some measurments on the B5.9 12 valve...I hear from friends at work...who drive Cummins trucks, that they are easier to modify and get performance out of cuz they are all mechanical, no electrical stuff(till I think 94). Also, about the 40 inch length, I couldn't find whether that was from flywheel to pullies or just the block itself. Pulling some dimensions on the car, I would have to cut 8-10 inches into the firewall, while modifying the windshield (lexan) of course.
Not sure about biting into it yet, if at all...finances, time, etc, etc. Just toying with the idea and trying to get opinions and stuff.