I'm honestly not even sure if the fronts are ball and claw still or birfs. Can you tell by just looking at them?
Running a booster with this year is a pita right? Because of the firewall rib?
Also...while I do really enjoy nice s*** and a frame off would be cool, I really don't want to be doing tedious s*** for the next 14 months.
You are probably correct .... Birfield was introduced in '68.
There are several workarounds regarding the firewall rib. @jamesurq .... can you post up a pic of the brake booster on your '69?