Looks like a good job of fabricating with available materials.
There was a major change from the 60-62 series and the 63-66 series trucks. I had a 63 at one time. That radiator is completely different, just as you described. I was just presenting my latest purchase as an example of the aluminum radiators available.
Sounds like you have a good plan and timeline established. I'm looking forward to seeing it run. :-)
