I hope I posted this in the right area. I have been searching for a couple of weeks now and cannot find the answer. I am in search of a pair of the air mixture screws for the outboard carburetors on a 340 6-pack (probably the same on all 6-packs). On the outboard carburetors they are located in the mounting base plate and usually have solder covering them so people won't adjust them.

Are they still available or is my best bet to just upgrade to the Promax billet throttle plate with the 45 degree mixture ports?