I'm thinking it's got to be ignition as well. The vacuum advance does not work(no movement of distributor when I goose it), but it hasn't worked for as long as I've owned the truck. The points and condenser are new, although the spring on the points does seem a little soft. Hmmmm...maybe the points are floating at high rpm. By the way, I watched your video, groovy 'Burb man.
