Performance Distributor in Stock Engine

stock 273?
you want something with around 15-18 mechanical advance so that you can set initial at 15-20 degrees
and end up 30-35 mechanical advance.

Then there is the vac advance to setup if you choose to use it.
Too funny - I was being more conservative on the initial.
The 67 plymouth 273-4bbl curve is pretty conservative on the top end. So advancing the whole thing 4 or 5 degrees should bring the top into the 30-35* range.