Hi there 63red,
I hope you don't mind a Chevy guy helping you out.
I have a 1973 Crane catalog that lists that cam as having an S-264 grind.
It shows 264 advertised duration, 220 duration @.050", lift on both valves is .434", and it is a solid lifter cam. Hot lash is .016" Int, .018" Exh.
Crane describes it as having good idle and low end torque
Crane's lifters for that cam are part number 51500, the valve springs have part number 99850.
Someone at Crane ought to be able to cross the spring info for you if the numbers have been changed over the years.
Good Luck,
Mike