agree with folks on here, go with the latter engine. your percentage of drive will determine how long things will last. keep it conservative, you won't have to do much at all to it as it sits. get it up there, you will scatter something. as far as cam, if you change it, wide lobe sep, like 114 degrees works best. you could run the stocker and be fine in all honesty. i am running a 6-71 gmc, 10% underdriven, it's giving me 6lbs of boost, and more torque than you will know what to do with. i have had great luck with running edelbrock carbs, the afb's are pretty cheap, and tune easily. a pair of 600's or 750's would be fine. my two cents, living with a blower car driven at every chance given......