This cam has 204 intake 214 exhaust duration @.050 lift. You are correct, it not very much duration, and will not bleed off very much compression. Your stock cam is going to be even less duration.. I think you will be just fine with what you have, with good gas and correct timing. If you had a little extra $ to spend you could get a little bigger cam, with a little more duration and lift to move your power band from 1200-4800RPMs to something like 1500-5800RPMs. If you cant buy any more parts, you will be fine, IMO. I ran a comp 268h in a 350 with 64cc heads and -5cc flat tops for years back in high school. It was just fine, as long as I didnt get carried away with igniton timing. Back in the day muscle cars came with cams very similar, maybe a hair bigger with even more compression than that. IE the 327 350hp in the 60's.