5.3 liter v-12 no lower right bank

What is your question?

the rotor and distrib cap burned out on right bank - repaired and ran ok for 3000 miles - then one day on start-up it was missing - idled for 5 minutes and the cat conv. was cherry red - gutted both conv(they were both plugged) and still not getting near the vaccuum from the air intake on right compared to left and the exhaust is cold on right side as well. Seems to be smelling of gas strongly from tha right exhaust. We can't figure it out.