whats a mild 360

As others have said, these terms are subjective, but I think a generally acceptable definition of a mild build is an effort one or two clicks over stock that provides a noticeable performance benefit - whether as an upgrade to an existing motor or a fresh buildup.

Deciding where mild transcends into radical is up to you, but again, radical is subjective. The 214/224 on 112 cam in my SBC seems "too radical" to one of my friends while another buddy of mine calls it a "400HP whimp" - go figure