is it worth installing cam in stock 318?

YY1 said
For the record-

67-69 318 adv comp is 9.2:1

70 is 8.8

72-74 is 8.6

"Roller" 318 circa 1985-1991 is back to 9.2 and probably more accurate.

FWIW, I've run the numbers and the advertised numbers on the early engines are too high, typically by at least half a point. The head chamber sizes in production run larger.