I know 2 folks personally whom swapped in the 3800 s/c engine.
Im actually considering selling my eco in the garage to get a 3800. But both of them have cooling issues, at idle, such as stop lights and traffic.
So i looked around the next and found this:
http://www.georgiazclub.com/tips/ztech/v8cooling.htm
I know the 3800 isnt a V8, or a datsun for that matter, but it might be worth a try, so im putting it out in the open for anyone who might be interested.
“Facts are meaningless. You could use facts to prove anything that’s even remotely true."