That sucks! Yes, on Mopars the rods have a bigger chamfer on one side that faces away from the other rod on the journal. Measure the widths of all four rod journals. They should be within a few thousands of a inch from each other. If the 3-4 rod is noticeably wider, CNC has a problem!!
The original lead based paint on my 70 Challenger shines up pretty good with some buffing compound! Of course, you can't get lead based paint anymore. I think to each's own on how shiny they want their car.
Welcome to FEBO from the desert! Nice looking pair of Barracudas! Curious yellow really changes colors in different lighting! Makes it one of (if not) the best colors out there!
What's the drivetrain in the 69?
My guess it the one needed a bushing to bring it into spec. No, you don't need bushings. Mopar has a lot of oiling up top which is great for a daily driver!
Chevron is my go to fuel stop! And like you, I have their Visa Card, so you actually see the price savings at some stations! Anywhere from a few cents to 25¢ a gallon!
On the 906 heads, concentrate on the bowl area under the valves next to the big boss around the valve guides. You want the air/fuel to swirl into the opened valves! Gasket match but don't touch the floors! Especially the exhaust!!
OK, after measuring six crankshaft snouts where the balancer rides, I got between 1.529" and 1.530" with all closer to 1.530". I then measured five harmonic balancers and got an ID range of 1.528" to 1.529" with all of them closer to 1.529". So about a .001 to .0015" press fit which makes since...