calling cam companies

You're not going to get an engineer on the phone. That's Buffy-the-phone-girl, reading a prepared response from her screen. Not her fault, she's limited to recommending at least one product whether it's best for you is not her problem.

Another problem: understanding cams has 2 distinct subjects which overlap by accident:
1. how do the whirley bits function (this has naught to do with engines and combustion, just metal, springs and geometry - especially rocker arms)
2. what does the engine want the valves to do (and doesn't care if it's by pneumatic, solenoids, or pixie dust).

Just my 2¢? I don't know anyone of Harold's quality that you can get on the phone. Some of his comments are still on Speedtalk.
After 50 years, your radar gets really sharp at picking up "he sounded good, until he said that really stupid thing" (name on request).

Why you see big LSA numbers with big engines: they need HUGE duration, and that LSA is how they hide the overlap.