Running great one day and next it stalls every time I hit the gas too hard

This is likely a lean spot caused by an accelerator pump shot gasket. I would start with the easy stuff. Set the fuel pressure at 7psi with a Holley. Make sure the float levels are set correct and pull the air cleaner with the engine running at idle, for two reasons,
1. Look for fuel dribbling from the boosters. If it is either the float level is too high or the needles have trash in em.
2. Check the pump shot. It should start to spray instantly when the throttle is cracked and you should get a nice spray out of the nozzles when rapidly opening the throttle by hand.
Both quick easy checks that can tell you a lot.