I agree. 4bbl carbuerator is too much for an inline 6.

See if you can get yourself a nice upgraded performance 2bbl carbuerator from either Holley or Edelbrock. I have a Edelbrock performer series 4bbl 600cfm and its great. With normall cleaning and rebuilding it has been useful.

Now if you have a 1bbl carb which is a very good chance it might have, being they put 2bbls stock on V8s back in the day, then upgrade to a 2