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When finalizing the timing it is important that you do not set it so far advanced that you get detonation (knocking) under any circumstances. This is not good for long-term engine life. My guess is that 18 deg BTDC is probably going to be too much. What I would do at this point is take it out for a spin and see if there is any knocking under any conditions. My worst case scenario is when accelerating uphill in a high gear. I would back off on the timing until it is reliably knock-free and set it there or a couple of degrees more retarded just in case. One of the things which changes the knocking tendency is the richness of the air/fuel mix. So if you are planning on doing any adjustments to the carbs after this you might want to be more conservative in the timing setting if you do not want to have to go back to fiddling with the distributor again. If you go all the way back to 10 BTDC I think you will be completely safe but will not get quite as much performance out of the engine as you would at a more advanced setting.