need tuning help on 340

If your compression is 9.5:1 or so and you have a stock cam with 3.23 gears your probably fine with an initial timing of around 10 - 12 degrees and a total of 34....right where you are.
You can recurve your distributor to get a bit more initial and keep your total timing around 34 but you are not racing so keep it simple, especially since you said it starts and runs great.