[Mr70]

"Don Yenko says he built only three or four L-88 Chevelles for customers that he recalls (according to an interview in Muscle Car Review Aprial 1987) and out of those three or four how many also had the L-89 Aluminum Heads options as well."

Among other things,RPO L-88 already includes Aluminum heads,it's not an extra on top of that.....Craptastic!