340 carburetor selection advice
If you are going with a Holley or Holley clone, the first thing you have to check is the emulsion stack. They usually come with 3 or 4 holes open. That’s way too much.
You’ll need to restrict the transfer slots because they are all too big.
Unless you are running the linkage 1:1, you don’t want it idling off the secondaries. And if you do do 1:1 linkage you need a power valve in the secondaries because you are going to cruise on the primary and secondary main jets.