Just a freshening up will do it good. The LD4B is a great intake and it sounds like you have that under control. Either carb would be fine. Cam's for a stock 318 have been discussed here to death. Unless you want to add a higher stall converter and possibly rear gears don't go too big. I recommend keeping the @.050 duration below 230°. A simple off the shelf Comp cam that many have had good luck with is the 252H. Here's a thread of interest. (post #5) THere's mild Sealed Power cams, Summit, Jones. Crower and the like. Many say the 340 cam is a good choice only to find those guys have headers, converter, and/or gears to make it work well. If you are going to bore it get some flat top pistons close to zero deck to raise the compression. Keep it around 9.5/1 or so and it will be pump gas friendly. (KB167)
KB KB167-030 Keith Black KB Performance Pistons | Summit Racing