Just thinking and looking for opinions.

[Putts]

I've got the VT365 in Putt, it's the Navistar version of the 6.0. I was looking at the guy in GA thinking he's got the right stuff---I'm sure he does---but in a recent video he said he's not going to make the Big Dog heads anymore for non-commercial customers....you might be able to convince him otherwise, but I doubt I could. Also he seems to be steering his non-commercial work to another shop now---again, mentioned in a relatively recent video.

I'm going to see if I can get someone to swap a crate Cummins 5.9 12 valve into Putt. It's done all the time on Ford pick-ups, but the shops that do that regularly won't look at a weird step van. 

At any rate, the 6.0 does have problems, but they can be overcome with dough. Good luck!