The original '67 specs were designed for skinny bias ply tires. Radials will tolerate a wider range of adjustment before they show unusual wear. A good part of the feel of a modern car is the more aggressive alignment specs they come with. An Aspen or Volare spec sheet will provide numbers that are a little more radial friendly than the original '67 specs, without getting too carried away with caster that will make the manual steerng even more manual.
If you have power steering and a really young tech doing your alignment, ask for '04 Subaru WRX specs. He'll know what they are, set it up, then tell you they weren't able to get all the caster, you'll shrug and say okay, pay the bill, drive away and the manners of your car will be transformed.