First one to post a pic of a no brow stock 318 LA piston from any year gets $0.79 via paypal from me...that's all I got left. Would be pretty hard to tell if its stock unless its got a Chrysler number on the bottom. I'm afraid Ill be keeping my money. All I've seen are 4 brow flat tops.
I'm looking for a photo. I'll look in the service. Manual tomorrow but all I have is a 70 manual and I am sure they are double eyebrows. The OP needs to find out if his are oversized. Probably TRW's or Silvolites.