Cams How do you choose one?

get the spring specs required from the cam vendor before doing springs
I know Jones grind does not take too big a spring and he has some hyd profiles that only take 105 on the seat (IDK if MOPAR- been awhile)
your stock type small block heads and manifolds is about the only place left where much additional exhaust duration is warranted (sbf is another)
Mike can figure it out with is computer program
others like Racer Brown and Porter use their long time experience
Comp tech will not have a clue
most catalog grinds assume headers which can use less exhaust but have long exhaust anyway- go figure