THEFERMANATOR
God
The 350 was used up until 04 I believe in some van's for specific use, 2000 in the regular HD's, 98 in the 1500 trucks, 99 in the TAHOE/SUBURBAN, and up until 03/04 in the solid front axle HD set-up's like the U-HAUL trucks. The 6.0 is an updated 350 in a sense. They share many bottem end designs, but they use the cylinder head design that GM came up with for NASCAR and drag racing back in the mid 90's. They use the splayed valve styling with the equally spaced runners. It helped to even out the cylinder balance. GM is known for getting a design and just updating it, not wiping the slate clean and starting over.