I have taken my 300 engine and removed the 2 barrel intake and replaced it with a 4 barrel from a 1965 340 engine. I have also tracked down a installed the correct Carter AFB 3326S and have it installed. I am looking for suggestions which jet's to use for the reduced airflow I get for a 300 as opposed to the 340 engine. Any other tuning guidance would be helpful. I am handier at doing the work than I am knowledgeable on this.