Clutch is grinding when pedal pushed to the floor and is sticky when it releases.

Your diaphragm clutch sticking when your first release the pedal is another sign that you have too much plate departure gap. Only need .030 or so for a diaphragm clutch.

Nothing inherently wrong with a diaphragm clutch, and no need to replace it with Borg and Beck. In fact, the lower pedal pressure of a diaphragm makes it desirable for the street. You do need to get rid of the factory assist spring under the dash. Either eliminate it or replace it with a lighter spring (which is what I did).