oldsmobilecaddy

hey guys im new here. i bought a 1981 cadillac fleetwood with an olds 350. at first i thought it was a 307, then a guy at advance auto told me it was a 403. i installed a new starter on it and noticed at the bottom of the block it said 350. so then i did research and ran the numbers from off the block and it came back 77'-81' 350. i want to beef it up a bit. ive swapped the quadrajet carb with an edlebrock 650 and spacer. next im going to put headers on it for duals and, update my cooling system with a better radiator and electric fans. i want to install a performer intake too. my friend told me i should add an rv cam? i have a th350 trans with b&h shift kit installed. ive put a floor shifter in too. id like to have a posi rear end. what do you guys think is best?