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.
18degrees dist = 36 crank degrees. You need to fix the timing first then fix the carb. Shorten the slots to get around 22 crank degrees and use the factory light spring with an aftermarket light spring on the other side to start. After you get that sorted out you can turn your attention to the carb.