This handsome, tousled-haired television lead since the mid-1970s has proved most convincing playing free-spirited and sometimes deceptively dumb proletarian types in sitcoms ("My Two Dads") and light-hearted adventures ("B.J. and the Bear"). A TV veteran, Evigan can be counted among the ranks of the almost perpetually employed, dropping in on series ranging from "Matlock" to "The Six Million Dollar Man" and appearing in numerous telefilms and specials in between stints as series regulars.Evigan started out as a song-and-dance man, stomping the boards in the 1971-72 pre-Broadway touring