Ok guys, the compression in my 1969 280 SEL is excellent in 5 out of 6 cylinders, 150 lbs. for those but cylinder number 4 is down to 122 or so. I noticed that the spark plug in said cylinder is just a little wet. So...I'm using the Bosch W7-DC in the car right now, I'd like to use a hotter Bosch plug in cylinder #4 so could you recommend a good place to start. Thanks in advance.