Take this from someone who had the exact same issue. Make sure your fuel pressure from the back to the front is over 25 lbs. It cured mine instantly. Goes up and cuts out in the air. Went to the pump in the back and raised it to 28lbs. The regulator in the front was at 8.5 and I didn't change it but changed the one in the back. Problem solved. Hope it works for you.

I would think the front jets(front now) could uncover
and its easier to suck air than it is fuel.... but
then again it could be a air issue going into the
carbs..... or just lack of fuel