The carbs included in that sale that Charlie has referred to are not correct M 335 items.
Also currently on eBay a different auction of M 335 items.
This other auction (or "Buy It Now" ) includes the super rare and correct aluminum bell housing.
The one carb included in this auction has the correct LIST number and at least one of the correct metering blocks.
It does however appears to me as having an incorrect primary fuel bowl.
http://www.ebay.com/itm/1956-Mercury-M335-intake-valve-covers-rocker-shafts-holley-carb-bellhousing-/282644609812?hash=item41ceee7b14:g:G7IAAOSwHsBZpCUP&vxp=mtrAll rare and expensive toys.
Oldmics