I know I am getting a little off subject here but since you are asking about improved carburation let me throw something else out. You can buy a centrifugal advance electronic distributor fairly reasonably priced from Speedway motors or similar supplier. Also it is fairly simple to modify an early Chevy distributor to fit a late flat head. I am running a Chevy distributor, Holly 390 cfm 4 barrel carb combination. This solves both the fuel and vacuum advance issues. The Holly supplies the correct vacuum the Chevy distributor is looking for. The distributor obviously must be recurved. I think I originally found the information for this conversion on the Ford Barn Forum.