Adjust valve lash on unknown cam

I've run them all. .008/.018- .010/.020- .012/.024 None made the car run any different.
Any above will be fine.

The only Slant cam I ever had was a Clifford that had a 548 lift and cam card stated .030/.030.
That Clifford cam I experimented with .022/.026- .024/.028- .026/.030 again no difference in the performance.
Your 66 just looks outstanding ! That color pops.