I had to replace my radiator in my 66 last year. I initially ordered a radiator from my local Autozone because of the price ($215.00), then after waiting 2 weeks and not recieving a shipping confirmation I was told it would be another 4 weeks before my radiator would be built! I cancelled the order promptly.
I purchased a radiator from LMC and have been very pleased.
I have the 250 6 cylinder with manual tranny. The price was $289.00, the fit and finish was perfect. Good luck