Best original looking radiator

I would take your old one to an old rad shop and have it recored. They will put an additional row in it(if you like).
I did that with my 69 340 rad. Be diligent on maintaining/flushing your cooling system. For the amount of miles we put on these relics it SHOULD be good. Provided everything else(fan/shroud t-stat, pulley etc) is in good working order.
The guy who did mine(Dennis) is/was affiliated with Glen Ray someway, somehow. The rads he has done and brass work is/are works of art.