The problem with bog will not be in the fact that it is running a dual carb set up with the OE cam. The only reason for recaming it would be the same reasons you would use for any single carb system.
The likely places to look are in the accelerator pumps and linkages, or the vacuum pots that open the secondaries.
There currently are no roller rockers available for the the Nailhead. Dr. Frankenbuick did draw attention to a site where the fellow was developing some for it. I believe he was asking for preorders. I can't find the name or site right now.
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