This amp is later than that Joe. Feb of 72. He has a board that looks like this, but not populated the same, and his has nothing on the trace side of the board, this one has plenty on the trace side.
I have some chassis' I got from Ed a year ago, along with 4 transformers. I don'y know if they were 4 fin or 8. The bias transistors don't have a P strap. They have the transistor heatshrunk, and a hook strap over them...