Hey gang. I just bought a used Performer aluminum intake manifold for my 400sbc swap that's ongoing from a friend. For $50 more he threw in the carb that was sitting on it and said that it was running good when he took it off, but wasn't exactly sure what model it is. Any ideas on the CFM's of this carb? The specs are as follows: Older Holly Double Pumper Mechanical Secondaries Model # 6R-4237B List # 6853 0990 I have searched all through google and the Holly website, but I cant find any info with these numbers. I'm trying to search here, but I keep getting a "dead" link. Any and all info would be greatly appreciated!!!