It depends on which fuel and idle RPM.
I would try swapping the carbs from side to side and see if its them or maybe a vacuum leak on the intake
I can't remember now if you have Stromberg Carlsons, Holley carbs or the other brand that I can't think of right now Either way they are fixable, it is a matter of figuring out which part needs fixing, idle circuit, transition circuit, float level or????
Good luck, let us know what you find wrench: up