Those are supposed to be good heads if the studs are replaced with screw-in studs. I think they are similar to the 670 in flow, but with a more "modern" combustion chamber - like the later Ram Air 3 and 4 style. Largely ignored, probably because they were not used for Ram Air I heads in '67. I have always wanted a set of those to compare to my #670's ... which I just sold.
Have you had any work done to to them?
You will probably be dealing with racing gas if you don't open up the #62's a little bit.
