We were testing back to 1968, but that JUST changed this month to 1997 (or something like that). Besides, GVW over a certain weight is exempt from testing.

I want remove all of that head-ache of vacuum mess, but what do I need to leave there for the HUGE tank to vent properly?

EGR (if there is one, I'll look because I don't recall) and all that krap is going away. Might even be changing to a 4V set-up before I'm done, and I don't want to have solve the vacuum line puzzle.