Timing suggestions for 360?

I have a couple of caveats to add;

The vacuum advance pod has a number stamped on the arm (usually on the bottom side so you can't see it when it's installed) that lists the total possible advance you can get. The number is expressed in cam degrees (don't know why they did that when all discussions of timing are in crank degrees) so you need to double the number to relate it to timing at the crank.

The adjustment changes the preload on the spring that pushes the arm back to the zero position. Making an adjustment changes the vacuum level at which the advance starts to move and consequently the total amount of vacuum required for full stroke. So you could add enough preload that it will take more vacuum to get full stoke than the engine generates effectively limiting the amount of advance. If you need to need to limit the timing the advance can add you are going to better off getting a pod with less advance built in.