We put an Air Mobile direct replacement into our '66, works and looks awesome! I'm not sure how your transmission cooler lines are routed but they can custom make it to fit what you have in there. Not the cheapest but a very nice product. Couldn't find their website and I don't have the part number (we bought ours when they were at the Goodguys in Pleasanton) but here is their contact information:
6407 N 53RD Ave
Glendale, AZ 85301-4612
(623) 931-0135
Ryan
Here is the raditor in our car: