An alternative to modifying your points plate. Adjust the points gap to slightly out of spec. IIRC, you adjust the upper points (right cylinder or red wire) to a gap of .019" (3 over stock) and the lower points (left cylinder or green wire) to .013" (3 under stock). Then you time the right side by rotating the dizzy, and then you will be able to slide the mezzanine plate sufficiently clockwise to advance the left side enough to get the timing right on both sides. Dwell will be a bit messed up which you can get back with an ignition amplifier if it matters that much to you. Since this isn't a V-8, dwell isn't that important. I actually find it easier to make small adjustments in the timing via changes in the gap vs sliding the mezzanine plate. I also replace all the flat head screws under my distributor cap with tiny allen bolts (and washers if necessary). This way loosening, adjusting and re-tightening becomes much more deterministic.