Those lift figures are most likely at .020 (advertised) duration, not .050. Still big though ;)
My Mini-Express mushroom-lifter cam with .654" gross lift was originally 316 advertised, measured at
[email protected]. After a light regrind to restore lobe taper, .652", 312 adv,
[email protected].
Anyhow that advertised duration doesn't tell you very much about the acceleration on the flanks so as mentioned a dial indicator and degree wheel is your friend here. I'd guess it's in the 270's somewhere but who knows...