I'm rebuilding a stock 65 289 and I'm considering options. What can I expect from keeping the stock 2 barrel carb and intake as compared with changing to a 4 barrel set up? Should I go with the 4 barrel? Should I look for OEM or go with aftermarket parts? What about exhaust? That's the one mode I really want to do...dual exhaust. Will the 2 barrel really limit the performance? What about cams? How far can I go with the cam using the 2 barrel with possibilies of upgrading to the 4 barrel in the future?