66 273 4BBL Carb Help

If it bogs and chokes/dies after 2 minutes, that sounds like floats. Either the needle/seat is not sealing or your fuel pump needs to be regulates down to about 3-5 psi. also check your floats for sinkers. Only other car I worked on that would act up after 2 minutes like clockwork was a fuel pressure/float issue, black pump into an Edelbrock with the regulator turned all the way open, 15 psi! I think the ballpark on a Carter/Edelbrock is invert the top and the floats should lay parallel with the top, but your spec will be called out in the rebuild literature.