Yep. It's in the back of the electrical section under ignition of the Factory Service Manual.*
For the rpm the timing should be set at, go the fuel section.
Of course if you've changed the distributor, the factory setting for that year, etc, may not be exactly right, but should be a good starting point.
Your '67 will be non-CAP unless it was a sold in California.
*I'm sure I've posted the initial timing for '67 225 where I graphed the curve if you want to do a search here.
