There were initially 3 versions of the ducted hood air cleaner for Camaro:
SS-350/manual-no snorkel valve, 3/4" vent tube
SS-350/automatic-has snorkel vave, 3/4" vent tube
Z/28 & all bbs: no valve 1" vent tube.
Later in the model year the base was modified to add the bead around the bottom.
Of these the 350/auto probably is the hardest to find. Someone just bought one off ebay for less than $100. That was a steal but $2500 is hard to believe.