Made some progress on this today, before the heat got to me.
Still cannot find a radiator that has two outlets on each side. Figured this would be easy.
Only one I found on line is in Europe.
https://races-shop.com/universal/404...2-outputs.html
Tempted to just purchase one for a 69 Camaro BB with four rows and a fan built in.
Found this one on Amazon.
https://www.amazon.com/HonorPower-Ra...1zcF9hdGY&th=1
I know; it is made in China; but it is the same brand as the big four row I put in my El Camino, and I was impressed with the quality. It also solved my problem of running hot when towing in hot weather.
I want a big a$$ radiator, as the last thing I need is for one to start puking while I am breaking it in.
Because I won't need to bolt up a fan on any of the engines I will be testing, I can just snake radiator hoses around to get it hooked up. Stupid idea?