Wasn't Perry King in "The Wanderers"? He was fine in that.
He wasn't in that film - maybe you're thinking of Ken Wahl?
He was in The Possession of Joel Delaney, a 1972 film (with Shirley MacLaine) that got quite a bit of publicity when it was first released, but seems to have become obscure over the years. Scary film, as I recall.
Signor V.
"For me, there's only my wife..."
"Sure I cook with wine - sometimes I even add it to the food!"
"When life itself seems lunatic, who knows where madness lies?"
"It was a grass harp... And we listened."
"Do any human beings ever realize life while they live it? Every, every minute?"
