[FWB]

the 4150 and 4160 are really very different patrick, the 4160 which is a universal type of 4bbl is what was used on most factory 427's one metering block and a single fuel inlet.
the 4150's are all not like the carb you pictured they also include the 1000 cfm and 1150 cfm dominator carbs. the BJ\BK holleys on 427 low risers and the BD\BC holleys on the med and high risers were all the 4160 type. they were one metering block. the two metering block type won't fit on the factory manifold. the 3310-1 is a 4160 the 3301 is also a 4160. one has a choke one does not