The Edelbrock Performer (2121) or Holley Street Dominator (300-39) are your best bets for a stock 289. They are designed closely after the original iron 4bbl intakes Ford used on the 289, and your stock mechanical throttle linkage should even work which would save you from having to do a throttle cable/cable kickdown conversion.
For the camshaft, you have countless options. Edelbrock's Performer cam, numerous Comp and Crane versions, not to mention Erson, Isky, etc, etc, et al. Keeping with the mild goal, look for something that doesn't have much more than 260 advertised duration and not much more than 212 duration at .050, and something with around .450 valve lift will make for a peppy 289 with great idle and throttle response and will match the above intakes. The #1 thing to be concerned with is valve springs. The stock springs on the stock heads will not be fond if the increased lift, replacing the springs to avoid possible binding should be done. Also, new motor oils lack the zinc and phosphorus needed for adequate break in of flat tappet cams. Make sure you use PLENTY of cam and lifter lube (make sure you buy and install new lifters if your cam did not come with them) and use either a racing oil , Shell Rotella T, or a ZDDP additive to make sure your cam doesn't wipe a lobe because you didn't have enough zinc in your oil.