Replying to my own post, just to end the suspense and provide some amusement, here’s what happened:
Although I owned and drove the car for many happy miles and years it developed a hot running problem which in spite of testing virtually everything in the fuel system I was unable to fix and so the poor car sat in my garage for over 8 years. Now retired, late last summer I decided to give it another go and the first thing I did was to start with changing all the fluids. When I got to removing the oil filter, it would not budge, my ring style oil filter wrench only began to crush the housing. I purchased a big slip joint pliers style oil filter wrench, and applied as much force as I could near the intact base of the filter ( yes I was turning in the correct direction). It still would not budge. I then decided the only path forward was to remove the oil filter mount from the block. This is very difficult with the oil filter still screwed on, especially when it has sharp jagged metal exposed from the previous attempts. I finally got it off, on the bench, and had to mostly grind the old filter off. The rubber gasket seemed to have glued it self to the alloy mount ( yes, I always oil this when installing and thought I was pretty careful about not putting the filter on too tight). About this time I had to go in for surgery and wasn’t able to work on the car until the beginning of this year. I have it all together, running, but my oil cooler is just sitting in place. Access to the fixings is very limited here. Along the way I contemplated deleting the oil cooler entirely, but I wasn’t able to remove the big slotted screw to get to the bypass valve for removal so I abandoned that idea, and put it all back together as per stock. I may eventually have to replace the hoses, but at least I know I can get themx on and off having done it a few times.
As for the hot running problem, my latest theory is that the ignition coil was breaking down when hot. I’ve replaced it but due to weather haven’t had a chance to test the car on the road. I apologize for the long diatribe, but I am embarrassed to have lost some of the fixings and was going for sympathy. d