Lost all oil and oil pressure while driving (Need help diagnosing)

A long time ago I was getting on a highway in my 340 4 speed road runner and getting up to speed which didn't take much, I see smoke all over the place so I pull over and check under my car and oil is leaking badly. Car was running fine......Had the car towed and the shop where it ended up called me to let me know my filter was ripped. Apparently that inspection cover that bolts on and covers the flywheel is important for something......Who knew?....