timing advance how much is to much

[aussie merc]

did a major tune up [valve set, carb rebuild ], etc engine is 239ci with i believe to be stock cam, compression, heads etc fitted with twin97s and fenton headers after setting carbs best vacum that i could obtain was around 16" at idle 700rpm so advanced ignition previously set at pointer i suspect is 4deg btc when rechecked found i had added added another 6 deg {now at a total of 10 deg} starts ok sounds ok its being fed on 91 octane but im worried it may be over advancing as revs rise your thoughts and experience appreciated