I got a carb off an 85 for my 82 the Holley 1945's for each are different. Mine had leanburn but the carb also had a ported spark tube for the dizzy. The 85 carb does not. So simple answer, there is no where on that carb for vaccum advance. I had to swap throttle bodies from the 85 to my 82 (throttle shaft leak), I had the vaccum hooked up but timing was always advanced and it backfired nonstop at idle. Took the vac advance off and it runs better, but no advance period. It'll drive fine without advance, at least mine does
