Thanks for the info guys. There are just too many choices of plugs out there !
According to the Porsche 911 Performance Handbook the 1980SC ROW had 8.6:1 compression and 188hp with the 930/09 engine.
Not until the '81-'83 ROW 911SC's did they get 9.8:1 and 204hp with the 930/10 engine. I bet they are noticeably quicker then mine.
Thanks,
Rob