8 flat check out on you tube Mark Fugazzotto,and her on stove bolt has same truck with 7.3. He has modified a wiring harness that's great for 7.3 in a 49 6400. You will probably be able to offset your engine a few inches to the right to clear gearbox we both did.he has original front suspension,I have installed a P3032 IFS out of motor home.