I realize that after all the discussion leading up to the descision to ge the engine rebuilt I never told you all how it turned out. Well...
It cost a bit more than expected because the mechanics at the bus garage had done a few mickey mouse modifications to the bus that were difficult to spot until everything was removed.
However the 366 small block coverted to propane is now great! I averaged 6mpg fully loaded (helping people move, both ways) through the rugged and high mountain passes in BC. She pulled solid. Cruised comfortably between 60-65 MPH. The governor kicks in then. On the passes I was passing big trucks, most RV's and recreational boaters (and volkswagons but that doesn't count
So, for those of you who were wary of sticking with this engine I must say it performed much better than anticipated. Over 3000 kms and all was good. Well, accept for the aluminum cover over the fuel pumps hole. It warped in Banff, so a mechanic came out from Calgary to replace it roadside. No biggie. There are worse places to sit on the roof and look at the scenery.