If you are going carb, why stick with the small displacement mod motor? Get yourself a Man-O-War block, punch it out to 4.125 bore, 4 stroke so you have a 427 small block. Then add the carb and bottle and start shooting for deep in the 9s
From the dyno numbers I've seen on carbed mod motor setups, they make some nice peak numbers but area under the curve is sacrificed.
Definitely interested to see your results with the same amount of nitrous.
Tony