I am thinking about installing a Shelby 500 engine in a 33HR. The engine has only 940 miles and includes the entire engine harness, computer, ect., along with allthe required misc. parts. My question has to do with the FFR instructions for setting up the coyote and buying the Ford Racing harness. Why can't I use the original Ford engine harness and computer? This is set up to run the engine while monitoring the supercharger and the intercooler pump/radiator and it doesn't look like the Ford Racing harness is set up to do those functions. I'm sure there may be some interface problems with the FFR supplied harness, but what other significant issues might I expect? I've built a ton of cars (including 7 FFR cars) but the computer and wiring are always my biggest headache.