Edelbrock has an instrution book on their website for the Edelbrock Performer carb - a 600cfm straight from the box is too "big" for a 283 as they are nominally set up for ~350 CID engines. The IB takes some time to understand but will allow you with proper jetting and rod, springs, etc make it acceptable. Everything is available from Summit or Jeg's. Holleys - leave for competition use!!!!