Robin:
I used this chap a few times. His Dad started the business and may be retired now but they used to bring him in to do special jobs... an artist with brass and solder and the only guy I found who still rodded out rads! They've done a couple of flathead V-8 Ford rads and the one out of my White half-track for me. Not cheap!
Macpherson's Radiator Service
11 Bell St
Carleton Place, ON K7C 1V8, Canada
Good luck!
Mike