take off the cap & check that the rotor is retracted all the way (it should be from the springs unless the slots/pins are gummed up). loosen the holddown clamp & turn the dist housing slightly a bit till the magnet is dead even with the closest reluctor tooth. tighten the clamp.
Make a magic marker mark on the side of the dist housing straight down vertical/plumb from the rotor tip clocking. replace the cap & make another magic marker mark on the dist housing side inline with the "bulge" of the particular cap terminal where the rotor is located at which will be pretty close to your first mark. You want the rotor at rest to be pretty much clocked right at the cap terminal bulge center & the can will shift RP CCW on a SB so ideally you want the rotor to be a bit CW from dead centered. edge to edge in a vertical plumb CL is good. You do have some leeway there cuz the cap terminal is .214" wide and the rotor terminal is .244" and the can shifts the rotor .023" around its travel arc for every degree stamped on the can. also check the rotor tip to cap terminal clearance, ideal is to reduce it to .015" by drilling out the rivet & makeing your own blade. On OE dists, the reluctor gap opens up as the can adds advance so if your dist does not then that is a bennie. Are you sure yours is staying at the same .008"?