I have been toying with my 67, and after re jetting it back down for pump gas and not the leaded 112 my uncle was running in it I noticed the 2 screws on the side of the rear metering block are missing.:bigtdown: No wonder my plugs look like they seen a ghost.
EDIT: I should mention I’m looking for the air / fuel screws
some 4150 type carbs came with 4 corner idle and some did not. Pull the metering block off and look real close, i have a big old box of old holley parts, so i prolly have some screws