Centrifugal advance
I have a 440 with initial timing is 18⁰ with full in 36⁰ coming in at 2200. Vacuum advance was hooked up to manifold vacuum as there are no ported vacuum ports on my tunnel ram and dual Holley 660s. We (Mattax and RatBastard) found that initial timing, manifold vacuum advance and quick ramp was too much. So, I ended up removing the vacuum advance entirely and using the port to add air to lean the mixture. Car works amazing.
