This hobby is very fortunate we have Berg's and the Brass Works as available radiator options.
I went with the Brass Works as they had made a custom flat tube with a 12V fan for my 39 P/U.
Got the hoses on and filled with 50/50, had a small weep @ the upper hose and a little red RTV has currently stopped it.
The Mothers mag polish has been the best for cleaning and polishing the shell, probably will take a week as my fingers cramp up after an hour