How to do an engine assessment on my wifes 81A?

[WestCoast]

a compression check is good for finding out the condition of the upper end, rings and valves, but will tell you nothing about the lower end, mains, rods or cam bearings, compression readings are good on one side, but as you said with different heads on one side could account for the lower readings on the other side, but they are all very close to each other, so I think every thing is all right on the top end, ford never gave a pressure reading at idle, all the book says is 30# at 30 mph, seems like you have a pretty good engine, any oil pressure at idle is good on those engines