The modern smallblock is a fully electronic engine. Late model ones can be fitted with a carb, but they are distributorless so you need an expensive conversion electronic ignition setup.
Most people WANT electronic engines today-for drivability and fuel mileage and power, plus, unless you are in a no inspection state, putting a CPU-less engine in a late model chassis is almost impossible. About the only way around it might be if you ran LPG or CNG and even then some states would still demand all the stuff that was there still be-cat con, air pump, EGR, et al.
There are after market electronic control systems that give you full programmability over RS-232 instead of automotive bullshit protocols, adapt to most crank and cam position sensors and MAFs, and fire most common injectors, but they are either high dollar or are DIY projects you need to build from boards and write the firmware in assembler or C++.
The AMC six just isn't all that bad an engine really....