Coolant flow

You guys with those A-Bodies, and other alphabet cars, got it easy. Next time you’re out feeding your dog, take a look at that doghouse out back and imagine cramming a higher powered engine, radiator and all the accessories in there and making it run at a reasonable temp on the street
I had a 63 Econoline. I added a SB Ford.

Same type of issues.

One thing I learned real fast is the pan between the bottom of the radiator and the front of the van MUST be in place to cool correctly.

It too had a tiny rad.