Hey John. How did you end up posting in the NY Chapter as I see you are from CO? Welcome and I don't it matters if you are going to put a Cummins into your Ford. There are a lot of sites devoted to that and there was a recent post on Pirate where one of the Four Wheeler TTC competitors is just finishing up that exact swap, but into a 1999 F-450. Good luck with your swap. Let me know if you do a thread on it as it would be interesting to follow.