Ok had a think on the carb model the vacum pipe connects to the carb nearest the oil filler cap. at the base of the carb.
My 145 had a coild pack so can't point you any futher, unless I find something in the manual.
Well, I couldn't see any plce to plug the hose into except for the intake point in the manifold....which actually had the vent hose from the fuel vapour collector plugged to it
I deduced that a T-piece is missing from the fuel vapour system and the dizzy advance should plug to the inlet manifold.
I set it up like that anyway, but the vapour collecter pipe is now hanging.......who cares !!!!