On my '78 I lucked into a new in box 3 row downtube copper/brass for free from a friend that went another way with his Chevy conversion. Once I coupled this with a Contour/Mystique dual fan assy. did the trick on my 360.
The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
We cannot accurately judge the trajectory of a speeding critter (cat, dog, sasquatch)
Record heat waves and floods only occur when we visit that area
Been replacing radiatiors for some time when younger. And found out this
2 core while cheaper will work on smaller engines well, like a six cylinder and a small v8.
3 core is made for mid size engines like a 350, 400
4 core made for big engines like a 427, 455
Now granted that they will interchange but, you will run into higher temps with a small radiator on a large engine. These can be adjusted with the proper thermostat. But will take some study time to achieve your desired temp range
My view is if I reach 250 degrees something's wrong. Most cars will run around 200 give or take 15 degrees.
I do know that alum. Sucks heat very fast an they r used in heat sinks, often without water.
Being in New Mexico and the heat we have in the south I would stick to this scale, I would want to remain cool as I could. Not so much for road driving as it takes care of itself, but off road you don't have the constant velocity of wind to help cooling so u are relying on the fan, and rad. size to keep temps down. Also when off road it is smart to keep shroud on, though not required, is a help as it pulls more cool air rather than mixing cool air and hot engine air.
Also on a side note, when younger I lived up north and would take out thermostat in summer, and replace in winter since your heater temp. Is directly related to your water temp. If left out in winter it would remain to cool to provide sufficient heat.