The 4bbl 318's ran the same cam as the 2bbl 318's. Difference was the 4bbl 318's never got a roller cam, they stayed flat tappet.
4bbl 318's were never 9.0:1 compression ratio, advertised or otherwise, the 2bbl did get an advertised 9:1 ratio though but that was with the 302 head.
As said by those that have actually done it, putting a stock 4bbl intake on a 2bbl 318 is an improvement, period.
