You could call them they are still in business. But if it was my grinder I would use a light spindle oil like Mobil velocite 10 which is a 5 weight oil, any thing heavier may cause the bearings to overheat. Bill
A 1YC is not only truck brake compressor those compressor heads were used on electric compressors I have a 3YC in my shop. You need to check that the motor is sized correctly and the pulley is the correct size . Bill
Have the same compressor the valves need to be lapped back in as I had the same problem and that is what fixed it .Parts are still available in the aftermarket including the filter material. Bill
If you have a local NAPA that you will be getting parts from then use their Prolink . It has a basic service writer program with labor hours based on Mitchell. Bill
That Pinto should give you 21 mpg easy . My parents had a 76 and Mom got hit in the rear on the parkway no fire . In fact the car was repaired and we drove it for years .