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.
That is true. Everyones idea of mild and good idle quality can be all over the map.
But the rest if the cam and motor specs matter too. That cam might only have 50° overlap, and/or high compression, effecting significantly idle characteristics. And the stick also changes the perceived mildness as the motor is not loaded at idle like an auto.
I too would be looking at a small solid.
