Camshaft Selection Information

Sorry it took a while but I found that Motor Trend article I had read several months ago. Here is the link.

1970 340 High Performance Mill Dyno - Mopar Muscle Magazine
+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.