I like them, done up correctly they can be very nice cars. I would probably redo the whole drivetrain. You can stroke a 318 to 390 or a 360 to a 408, so a donor magnum junkyard engine could be a good start. You can put in a 4-speed setup out of a volare/aspen I think. A rear end with some decent gears, a 4-sp F-body od trans with a couple mods and an engine swap and you could have a nice performing, reliable and driveable combo that knocks down some reasonable mpg.