Not to state the obvious, but lots of things cause a rough idle beside engine design. Carburetor adjustment, and internal condition, ignition timing, vacuum leaks, choke adjustment, where you set the RPM at idle, carbon build up, and more. Of coarse cars of the 70's relied on manual adjustment for all of this, which is never ending. Computers take care of most of it now.
There is nothing more gratifying than getting your engine dialed in without the help of computers! No matter that it is always temporary.
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