Another carb question

I would leave the 4bbl set up on there just change over to a 390 cfm Holley or try and find the long gone 400 cfm carter. I have tired both on my slanted six, preferred the Holley as it seemed to like it the best. My engine has .30 ob with a mild cam- cant remember the specs its been in the car for over 30 years.

plus with the 4 barrel parts are not an issue and it will have an electric choke, dial it in and enjoy hassle free carburetor for a long time. If the two barrel does not have an electric choke you may run into problems as you wont have any choke which will still cause you problems at start up.