You’ll have to decide for yourself how rough an idle you can live with.......cam accordingly..... and the final combination of parts you assemble will make what it makes.

I was talking with a customer yesterday that just finished putting some finishing touches on the install of a 418 6bbl in a challenger with ex manifolds and a stick.
That motor used a fast rate solid lifter cam, 242@.050....... he said the thing was very mellow.

How mild or wild it is, is mostly about how each person perceives it.