Base timing. Really ?

with the engine combo i have, should i be running vacuum advance? It does stink like hell at idle,,otherwise it does idle great in gear and doesnt come close to trying to stall..it only drops 100 rpm from park to drive, if that..this is at 18 or 20 *btdc. I would like to get the most out of the thing i can and if running vacuum advance will help it, then i wouldnt mind getting it going..