Pulled a known good rod and measured it (3.225) I'll pull the one out fo the running-ish motor tomorrow in the morning and report back; but...if the rod is wiped, wouldn't the same be for the eccentric?
But assuming I have a shorter rod; (they came in two lengths i believe) how would the warming up effect pressure output? It gets bounced back and forth like a floating valve or something?
As a note, after I swapped pumps, it "pumped up" the pressure as the system started drawing and then the needle would "tick"a half psi or so. If I revved it to 3k or so, the pressure would hold steady.

Also to note; it's a completely cast iron engine and I'm in Southern AZ, so today's ambient temp was 108ish. However, the cooling on this and all my cars is/are exceptional and this thing would/could/did idle for 20 minutes in the sun and never went over 196* when I was stress testing the heat system a couple of weeks ago. That and fuel supply was adequate to do that testing.
Frustrating but fun!