This past winter my 56 Victoria was hard starting on some cold mornings. At times, when I let go of the key and the engine didn't fire, the vacuum wipers would sometimes jump a bit. This made me suspect that my timing might be off .  I don't want to rely on the marks on the damper as It has never been reconditioned. I hope someone on this site can advise me on where to plug in my vacuum gauge and which hose to plug if needed. The engine is a 292 with the later model Holley 4 barrel and the 1957 type manifold. The distributer is the 57 and up model. I had planned on using the port on the rear of the manifold to hook my vacuum gauge hose to. I have been using this port to work my original vacuum wipers. The carburator has a small diameter hose that goes to the vacuum advance on the distributer. Should I pull this hose loose and plug it on the carburator end, or should I leave it hooked up at both ends while I set the timing. I assume I will adjust my distributer until I get the highest reading , Appreciate any advice.   George