This is the dAMBEST billet 4500, dash-1 option carb with original style linkage. Several venturi sizes are available; see 4500 brochure (link below) for specs and applications. It can be set up for gasoline or methanol at your request.
We have 3 of these originals left with 1.750" venturi and one each of 1.875" and 2.000". We're offering them at $900 off their original price: $999 each vs $1899.