Thanks for all the replies. What do you plan to pay for a 4BT? Here in Boise I have not been able to locate anything and looking at the internet, it appears that the cheapest used ones run $3500-4000K. I can pick up a reasonable 6.0 Vortec for about $1500. I already have experience with the Vortec and wiring in the FI, but it would be fun to try the diesel swap if I could find a reasonable priced one.