Camshaft Selection Information

+36 hp from a carb change sounds questionable. Since it is believed the factory rating of 275 hp was correct does how did they get 275 hp with a crap carb? Does this mean the dyno was 'optimistic'? I would be surprised if cam recommendations aren't in the XE268-XE274 range.
It'd be possible from a two to a four barrel. lol