Correct initial timing?

Yes i read it, some good info. However im not driving it in a parade. Idle is at 900 so it would be creaping faster then 3.5 mph.
So you set your initial first? Then whatever the vac advanced is at is what it is? Ive never even put a gauge on it to see if my cam is allowing the engine to produce enough vacuum. My 833 4th gear I believe is 1:1 and at 55 im doing 2k and at about 65 im doing 2500. Wouldnt that be too high of a rpm for vac advance to matter?
No matter what gear im cruising in I always keep it around 2k