Sounds like you've been hitting the Newfie Screech. Excellent.
Beware that stainless fasteners are only about grade 2 in regular SAE bolt speak. I totally agree with stainless stuff for non-tensile loads, but you might need to choose grade 5 or 8 for some stuff, like motor mounts. Whether stainless or not, I use socket head cap screws wherever I can.
Lets talk torque. How much will the International make? I think that the 7.3 was the pre-'04 motor, IIRC. Do you have a donor diesel truck that will give up the trans, etc? What turbo will you use? Factory wastegate or adjustable? I'm gonna geek out over both of these projects, and I hope you start a new thread for the truck.