273 Carb Size

My guesstimate is your stock hp 273 has peak power in the 4800-5000 range. While all these charts and formulas are fun and interesting, none of them take into consideration altitude/elevation or barometric pressure. In my opinion, I’m chosing the largest cfm carburetor with the smallest primary venturies that has vacuum/air door secondaries. Small primaries make for good throttle response, big size so I can use it on different size engines and air door so I can tune it to specific engines. The choices are vast, used rebuildable carbs, rebuilt warrantied carbs in all flavors, Avs, tq, or Holley. Or new carbs from edelbrock.