A rough idle can be caused by a really long list of things not being on spec and worn needing replacement ignition parts
When has the engine had a very complete tune up last time you know of and the basics checked ?
That would be the place to start once you know that’s right you can then determine if other avenues need to be investigated like a carb rebuild or possibly a head rebuild for example
I have a base but it doesnt have the mount boss for the kick down switch. Does your car have the TV rod or electric kick down switch?