I have a Harrison C/B radiator #3008566 used on 66-68 427 Auto trans and 68 Auto trans w/air. It holds pressure and didn't leak when I changed it out with a Dewitts unit. Its probably about a 7 of 10, with some bent fins where PO installed an electric fan. This radiator would not keep my ZZ1 cool in slow traffic with only the electric fan. Along with the part number is a tag -R666- maybe a date code? I would like to pass it to someone who can use it. Its in a wood crate, about 50# estimated and its yours for the shipping cost. Just let me know. Merry Christmas and Save the Wave. Bob