Thanks for really helping out. The curves and instructions are located here: https://static.summitracing.com/global/images/instructions/sum-851003.pdf
Quoting:
The factory installed medium blue springs in this distributor, generate a performance ignition advance curve that typically begins at 1200 RPM and generates 22-24° crankshaft advance; that is fully in by 3200-3300 RPM. This mechanical advance curve will work in most street performance engines.
