I got issues!

You said you had 34* at 3000. Later you said it was 36*@3000.You also said it was still advancing. So in other words you really don't know what your power timing is. You have to keep revving it up until it stops advancing, whether that be 3000, or 3500 or 4000 or(hopefully not) some whatever rpm.And then read it, and then change it back to 34* at that rpm that the timing maxed out at.
Then you can say with authority, the power-timing is 34* at suchNsuch rpm. Then you bring it back to idle and read that. And then you can say your idle-timing is suchNsuch at suchNsuch rpm.Then we can formulate a correction plan.

With 2.72s, and a stock TC, I think you may be expecting too much. Saddled with these handicaps you can move your cam any where you like and it won't make a hill of beans difference.

Now getting back to your carb; handicapped by gears and a low-stall,You are really gonna have to tighten up the air-door. Not just to prevent a bog, but to also prevent the beast from going rich, until the engine can take it.
Then timing; Once you know what you actually have, and it's backed up some, maybe it will smarten up.And there may be other calibration changes required.

But from your description of how it doesn't perform, there's a good chance that the carb calibration is off and/or the timing is excessive, or there is a mechanical issue. Or the rotor is needing re-phasing, or the coil is dying, or the plugs have been overheated one too many a time.Others have mentioned most of these things.
We need to figure out why the power ain't there.But first we need to rule out issues with spark and timing.
So 1).please list your cam specs
And 2) probably do a compression test.While the plugs are out,
3)give them a good inspection.
And 4)do a stall-test on the TC.
And 5)what A-body do you have?