I have run an AC bet that doesn't sit flush in the carb, makes no difference that I could spot. Yes mine did go pop at flat 12 afr (cracked liner) that was at 6.8/7k in fourth with 24/25psi.
It actually happened on the run off at pod, that was full throttle launch and full throttle changes all the way up the strip. I still need to double check everything to make sure it was actually lack of fuel that caused it. There was no sign of det at all the gasket was fine the lot. Was a bit puzzled if I'm honest.
I'm on it tho with exactly what I need to check and change of needs be to try and stop it doing it again.
When the bowl empty's it will do it at 20lb or so boost with o.e comp and a 285 cam at the top of fourth so if you at 11.9 at solid upto 7k rpm then you have probably cured the bowl emptying issue
Be careful in Fifth, it will happen a little sooner than in fourth. You might get away with it at 20lb boost once the boost gets past 22psi even the upped fuel pressure won't stop the bowl from emptying in Fifth. I top ended mine for about 2mins full throttle on my last engine at 24lb. Melted no 4 piston.
Carbs and top end runs don't mix with high boost.