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=mtr

All rare and expensive toys.
Oldmics

This is a new listing on eBay.  M335 368 engine valve covers, dual quad intake, carbs, and air cleaners.
It's not mine or listed by anyone I know. 

Click the link below that will take you to it

http://www.ebay.com/itm/1957-Mercury-M335-Dual-Quad-Carb-intake-368-Lincoln-or-Mercury-Big-Y-Block-/263197600187?hash=item3d47cca9bb:g:jWIAAOSwv~NZtHYV&vxp=mtr


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York