IF I want to run a carb I use a ThermpQuad, easy to tweak and they just work when right, especially if you go with the 9800 aftermarket ones with the electric choke setup. The one on my Dart has sat for 4 years and I started it finally after a few years of setting. The accelerator pump was stuck but with some WD 40 and a few pumps of the rod it was AOK again and started running great, even on that old gas in the tank, even did a quick burnout in the driveway after everything was up to temp and working smooth again.
If I wanted max drivabilty and MPG I'd definitely go EFI, but like said many after market setups are way too spendy and you have to modify stuff to make it work. Some of the stock stuff and the later 360 factory stuff can can probably be done cheap and mega squirt and others might be a option if you want to go low bucks and aren't afraid to make things and do it yourself.
Simple, go TQ, more complex but maybe worth it EFI.