The width of the 6.2/6.5 is wider than a SBC, the DD is very close to the dimensions of a big block Chevy. Depending on the exhaust manifolds, clearance there could be the limiting factor. The 6.5 turbo manifolds are real difficult to work with. I had a stock 1984 with the 454, a stock 1987 dually crew cab with the 454, and a stock 2000 dually crew 4x4 6.5 diesel, all of them were real close to the inner fenders and frame. The 6.5 turbo motor weighed roughly 750 lbs.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| 
