5 quick operation and Maintenance Qs

Because the car is relatively new (to you), you really don't know what you have until you gradually go through it. Personally, one of the first things I'd do is a compression check. This will give you a general reading on some of the internals. You know, rings, valves, that kind of thing. If the slant six valve seals are like the V-8's, that would be a relatively easy thing to do which may help with the oil consumption. Also check the PCV valve which also could help with the oil usage.

I have limited experience with slantys but I remember adjusting the valves on a Volare made a difference in how the engine ran and the quietness. A factory service manual will detail how to adjust the various links and stuff on the carb step-by-step. Another thing which could be crossed off your list.

The general rule for shrouds is the fan should be half in and half out. Again because you don't know the history, a new water pump may help because the blades deteriorate with age.