My old 235, to my knowledge is correct for my 1953 panel. It may even be the original engine, it was cast on Aug. 18, 1953 and is a low pressure engine. My 261 is from a 1959 chev or Pontiac car. But don't get too involved in this, I can simply measure the ports as I have the old engine and the manifold in the garage still. The 261 is now completely rebuilt and ready to go. I appreciate your help, Tim. I really was more interested in getting the correct horn anyway.
