Cam and lifters would also be a good addition - I was trying to keep it "bolt on" but by all means, if you're comfortable with digging into the "bowels" of the engine, a cam kit would be good. Summit SUM-K1102 is a good bet - 262/272 with .420/.442 lift and it's a hundred bucks out the door. You'll probably want to stay with a hydraulic flat tappet cam as the conversion of a 307 to rollers would not be justified (IMO). Broken in correctly, a flat tappet will be fine.

Bear in mind, that changing out the cam is a lot of work - i.e., taking the entire front of the engine off as well as the intake manifold and rocker arms. If you've built a 327/350 you know what has to be done. I've changed a fair number in the car, but I prefer to do a cam if the motor's out of the car just because it's easiest.