did you end up resolving the throttle issue? I may have missed a few update posts on that, sorry if this is redundant! I built a valve cover bracket that included the mercedes firewall mounted throttle spring which is needed for appropriate throttle control along with the small one under the injection pump. I did not notice one on your engine pic a few pages ago unless they mounted the big spring somewhere else.
Truck looks amazing
EDIT- ha not the problem. looks like it was an alternate issue discussed in the page 70s of the thread.
time for an index