273 that runs great, sometimes

I rebuilt the 2 barrel on my 67 273 twice before finding a hole in the float. Car would run then get very rich and die. Finally I dissected the thing all across my bench and examined it like an autopsy. Found the hole and had a new one in 2 days from my parts vendor. Fixed the problem, BTW I paid a pro for the first rebuild and found the problem on the third R&R.