Hi All, new to the forum but hoping for some help identifying this old Yale forklift. I am primarily looking for engine information since it seems to have a rod knock and I'll be tearing into it. This forklift looks like it was converted from gasoline at some point (old tank and filler neck is still installed). It now runs off of propane.

I can't seem to quickly locate any engine data tags, maybe someone can point me in the right direction? It looks like a continental 4 cylinder flat head to me? Thanks in advance!