383 with a hydroroller, "NEW" (about 20 runs) MSD pro billet dist. locked out timing and digital 6 box. new crane billet timing set with edelbrock cast thick alluminum cover. cam button, build sheet says its set at .006. stock GM large internal balancer. at idle the timing moves about 2* back and forth. at 3000+ the mark advances 2* and jumps back and forth so quickly i cant really tell where my timing is set. could be anywhere from 36* to 39*. with the dist cap off, i can rotate the rotor almost 1/4" back and forth. im thinking this is just the clearance in the gears. the black finish on the dist. gear is just starting to rub the black finish off. any ideas whats going on and what do i need to do to get rock solid timing? thanks Dave
