Part throttle bog then backfire?

I put a new carb on my car because the edelbrock was giving me too many headaches. But now I've encountered a problem I can't figure out.

With the new carb the car runs 100x better, but occaisonally the engine will bog badly(only at speeds while getting into the gas). If I let out, the bog will go away. If I dont it backfires, the wideband shows the car go very lean and the rpm dips to zero for a split second(only happened twice, now I just back off before this can happen)

Timing: 14 initial, 32 total.
Ignition: oem w/ 18 degree limiter plate in dist. + lightest dist springs
carb: summit 750 vac, untuned, idles at 12:1 cruise: 13-14:1 wot: 14-15:1(I know it obviously needs. Tune.