For Sale!- Holley 600 cfm carb.,brt. zinc finish.,electric choke,etc. #80457S.---Check out the links for more info-> (1)--- http://www.epinions.com/review/Holley_0_80457S_Model_4160_Street_Performance_600_Cfm_Square_Flange_4_Barrel_Vacuum_Secondary_Electr ic_Choke_New_Carburetor/content_407756050052 (2)-- http://www.holley.com/0-80457S.asp ---This carb was on my '79 Vettes 350 for,I guess, a couple years.I had zero problems with it,& I only changed it out when I swapped my Performer intake to an Edelbrock Performer Air Gap intake & combined it with an Edelbrock Performer carb,as well. Jegs lists it new,at $275-> http://www.jegs.com/i/Holley/510/0-80457S/10002/-1