Alright the Timing advance on these is realy wierd adn i have an idea, just running it by you guys to see if there are anny holes in it. Ok there is one ported vac line going to the distributor (no idle vac or wide open vac), then there is a second manifold vac line (vac at idle and pregresivly more vac through the rpms). Well i was ondering if i could just run the manifold vac line for my advance. Would this act roughly like straight weighted advance?