Your engine has fair balance across all cyls that is important too. It may be a little tired by the numbers but not bad. You can perform a cylinder leakdown test to tell if it is rings, valves etc. This is a much better health test. You can also pull the head and measure the width 85 mm for E and 87 mm for F. I would bet if you add oil to the other cyls the pressure would increase as with #1. I would drive it unless you are looking for some work to do or tracking a smoking or other problem. As we say in the electronics buisness. Don't fix what aint broke.

Greg Bodner
1970 1800E