Cams How do you choose one?

Thanks R&D
for those following:
Racer specs advertised at .008 so for those who want to compare with the Xe274hl (.006) comp this s more like a 280 comp or 285 Crane
as opposed to some grinders Jim seems to give all the info you need and I'd bet he'd give the seat timing for DCR calk if you asked
another note
notice that even if the exhaust is longer the lift is less showing RB is using a different series of masters for his exhaust instead of just taking then next bigger lobe down the list
this also makes it easier to set up your springs