I was in a similar situation. Decided that it was time to use my early B body with a 496 stroker strictly on the street. My compression ratio is a bit lower at 9.9:1 but I have iron heads. I decammed to a Racer Brown SSH-25 after calling them and giving my exact specs. I am running a 4 speed, 3.23 gear, 29" tires. Also changed the headers for 68-69 manifolds and installed a stock iron dual plane intake with a 750 dual feed in place of the six pack. I finally got the distributor curve worked out and everything seems pretty good as of last fall. My RPM is way down and I have beaucoup torque. If you're running an automatic with more gear, shorter tires, and a looser than stock convertor, you might get away with more cam than me. I highly recommend calling Racer Brown. Have all your engine and chassis specs ready.