The lengths, ratios, spring rates, etc. for the B/RB have a variable missing that affects whether this information translates into another engine type.
The range of rocker arm angle with a specific lift is most productive when the long (valve side) lever is passing through the mid-range of lift with the lever arm as close to 90° to the stem axis. Duh!
This range is greater when the valve lever arm is relatively short (not directly a component of ratio): the lever points closer to straight up & down at zero and full lift. This also applies a strong thrust vector against the adjuster.
What is safe with a 1.65" rocker (B) is less so with a 1.40" rocker (SBM). If you have different length measurements please post them?