We found an 8.1L out of a 2003 Suburban 2500 4x4 for under $1,500. It came with a 4L80 transmission, all used, but still healthy. We decided to swap it all into our 1986 Chevy K30 military CUCV truck we call the Alabama Army Truck (also known as the Alaska Army Truck or just AAT). We had built this truck in the past with an awesome supercharged 6.2L LSA engine that would roast the tires at will, but that engine got yanked and stuffed in our Ultimate Summer Camp Jeep, so the Alaska Army Truck has been sitting with open engine bay for a year now. The 8.1L would be a bigger, less expensive, and almost bolt-in swap.