Thanks for the tremendous compliment. It was a lot of work and a hefty budget, but the final product is pretty sharp.
But while I was the source of a lot of the planning and all the budget, Randy and Jason down at GRC are the ones who deserve the credit. I was working in England for the entire build, and didn't see it in person until it was just about done. It's one thing for me to say, "I want this sort of thing" in an email but a different thing for them to understand my vision and bring it alive. They did a better job, with better attention to detail, than I could have hoped for. It has impressed every single person who knows and respects what they're looking at and the level of effort required. We made a list of everything done, and it's pretty astonishing.
Regarding your questions:
Engine mods: KDP corrected, 3200rpm spring, air-to-air intercooler. The head was pulled after the project was complete and running, decked, valve job, new injectors (I think they're stock or nearly stock, don't remember) due to old injectors being irregular, re-timed with the new injectors, exhaust manifold and turbine exhaust housing ceramic coated, exhaust wrapped to the muffler. I have a noise monitor app on my phone, and in-cab noise before the above mentioned head work and re-tune was ~92dBA at idle and ~105dBA peak. Pretty brutal. Since the completion of the work above, and a little sound deadening applied, that has been reduced to ~77dBA/89dBA, respectively. Still loud, but WAY better-- just ask my wife.
Running temp ~210deg, highest boost seen ~22# but typically doesn't go over about 12-13# for normal driving.
RPMs at 65-70mph are in the 2000-2300rpm range. 60mph is right at 1900rpm or so. Will re-confirm on the drive home tonight, just to be sure. The auto makes it a bit of a dog in-town, but it's smooth and energetic on the highway. It
likes the highway, and the motor actually quiets down while up at the higher RPMs. Comfortable two-finger driving at 75mph for 3 or 4 hours in a lifted Scout? Yessir.
But the reality is that I'm clearing out all of my rigs. With getting laid off a few months ago, moving, starting a new job, with new family, in a new house, and starting grad school soon, etc. Have to start over. Two A-series Travelettes, an A-series Travelall, a DeSoto Hemi ready for someone's project, parts, a couple of vintage British motorcycles.... ....and yes, this rig too. Just can't do it all, and there are more important things.