What heads do I have?

Howdy! I've been posting on the early A body forum about the 66 Valiant I inherited from my brother. I am having to learn Mopar so please bear with me. The engine block has a 53020006 casting no. and the pushrods are hollow and oil the top end. It is using an LA-style intake so I have to figure out just what the heads are. Here's a picture of what I've got. What should I look for to ID the heads? Thanks - Jim
49217968486_7865df820b_o.jpg20191214_075125 by Jim Harris, on Flickr