The carburetors that are going to allow you to do this are going to be complex, the early 80's Honda civic pulled this off with a carburetor but it was with a mess of vacuum lines that very few could figure out.
The nice thing about the type of car that you are talking about is that the engine block for it most likely stayed the same for the next 30-40 years, other then getting a few more holes for sensors and a refinement in quality control, so you might be able to put an updated engine in that would bolt right in.
In my mind fuel injection is going to be the way to go, not just because it burns cleaner but because it lets you use less fuel by giving better control and that is what you want.
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