Don't really know anything about the factory EFI and running all the wires. The aftermarket set-up seamed the better route plus if I replace the current motor with saaaay a vortec I'll still want to upgrade the TBI, I hate the performance of that thing it's just a stupid 2 barrel, but they do run flawlessly
and are dependable. So taking into account the price of a rebuilt engine plus the injection. The 6.0 (used) plus the mounts, adapters, and flexplate comes to about the same money. Who knows I may just find a used 3/4 ton and give this one to my son. It's paid for so i hate to buy another and I couldn't trade this one plus the cost of the build for a 3/4 ton 6.0. Don't want headers on my daily driver just personal preferance. Oh yea THANKS for the thread I'm going to read over it right now.