Redneck Re-curve
My plan: set the initial with the "vac gauge method" (Google it), too long to type out! then set the total to 35 with the FBO $22 plate (can plugged). mix/match springs (after tossing the heavy one with the elongated loop on one end) so you are just under the pinging point at WOT up thru the gears on your hottest/driest (most likely to ping) day then plug in the can & adj it with a 3/32 allen wrench so you are just under the pinging point in everyday driving under varying load/RPM conditions on your hottest/driest day (CCW slows the rate/not the total & get the right can for your app (a DD needs more advance than a race app). there is silent ping/peoples' hearing varies/gas quality varies so give yourself a cushion down from the pinging point. check/correct rotor phasing. reduce rotor tip to cap terminal clearance to .015 (drill out rotor rivet & replace with a piece of metal). confirm bushing slop is minimal. reduce lower shaft axial play to .005 (speedway motors has a kit for $5) or source 1/2" ID washers with no bevels on the one side (ID/OD). use a black or brown cap with ribs underneath with BRASS terminals.