440 Engine Guru's Help

my engine is 197 average cold cranking, 11.5:1 with iron heads, 260*/260* @ .050 flat solid, runs fine all day with 37* total advance, on 93 pump gas. if U think it is detonating do not go more than 36* total advance. maybe the damper outer slipped-rare for mopars-try race gas. vibration may be the engine/damper/flywheel out of balance-some folks are confused about the correct mopar combos.