I was actually amazed that the 77 year old radiator worked as well as it did with the later engine setup. Consider that the 235 has twice the power of the original 207 and then add the supercharger and operate it in the HOT dry desert climate with the water pump/fan slowed 30%...... impressive!
With the Harrison radiator warrantee expired 76 years ago, I guess the leaks that developed in the middle of the core are not an indication of poor quality.
It was time to renew the cooling system.
Reviewing all the options, copper tube/fin, aluminum tube/fin, vertical flow/cross flow, and original V core, I discussed this with a very experienced radiator guy. Hands down, he recommended recoring the original with the most efficient core available which is the V core original design. It worked perfect after 77 years, and it will do the job better than anything else now!
Just a hint, changing the radiator in a 34' is a project. The radiator sits in the shell and the shell is supported by the core support, ugh. Everything comes out at once.