2 barrel to 4 barrel conversion

From your signature and text I'm assuming it is a 1973 Dart Sport with a auto trans. Lets say you get and Edelbrock performer intake and Edelbrock 600 cfm carb. I dont think it will be to much trouble to get your linkage to work. I've gone from /6 to v8, from Edelbrock to Holley using the same throttle linkage. You need new gaskets and depending on what carb you get you might need to make or buy a bracket. No big thing though. I might be vague here, but there is not to much info in your text, what Im trying to get across is that it is not such a hard task to get it done :)