advance

I would set the initial with the "vacuum gauge method" then shorten the slots to get 36 total (initial+slots) and the FBO $22 plate is by far the best bang for the buck way to change your mech adv amt, then toss the heavy spring with the elongated loop on one end & sub in a mr gasket/MP/transdapt/OE, one of the three, light springs in its place along with the OE light spring for a start & mix & match from there staying just under the pinging point at WOT up thru the gears on your hottest/driest (most likely to ping) day and there is silent ping & peoples' hearing varies so give yourself a cushion then plug in the can (if used) & adj it with a 3/32 allen wrench so you are under the same pinging point in everyday driving conditions under varying load/RPM. CCW slows the curve. do these 4 in order & on the spring selection you do not want the adv to start any less than 1-200 RPM above your hot in gear (auto) idle speed (or neutral) which is what you are at from stoplight to stoplight.