Thanks for the info Jim. That’s why I waited for the 54 235, I had already read about all those advantages. The engine I got looked to be in pretty good shape on the outside but the head is going to need rebuilding, that would cost what, around $400? So if I got this rebuilt 55, I could just swap the heads and anything else I needed, water pump, timing chain, ect. all for around $600. Do you know why the 55 makes so much more power over the 54? The pistons on this one are stamped .030 over, that should make for a little more power no?Thanks for the offer on the parts.