Daily driver suggestions.

The best milage and pep I have had with a slant was a '68. Set it up with a pre-CAP timing curve and intial timing. Adjust the carb best you can and your good to go. It will probably still be a little lean at idle but should be OK.
If you put on enough miles each year and hate checking and adjusting the points, that would be the only real advantage of changing ignition.