A friend ran across Nailhead motor in a garage and would like to know the value. So far, Google and I have discovered that based upon the block casting 1364704, it appears to be a 63-66 and 425 cubic inches. The head casting number is 1196914J comes up as 59-66 364/401/425. I didn't find out what the "J" means. I have now exhausted my Nailhead knowledge. Based upon the pictures, can anyone give me a range of what this might sell for? He did not pull back the shirt covering the intake area, but based upon what I see in the picture, it looks like the intake is missing. It may be elsewhere in the garage. I assume there is a big difference if it is a single or dual quad set up. Let's assume for now that it is available and it is for a single carb. Other than the intake, distributor cap and carb, he said it looks pretty complete. I love the finned valve covers. Of course, the big unknown is if it rotates freely or maybe even runs. Unfortunately, the owner is recently deceased, so there is no one to ask. Any and all information and corrections to my brief research will be very much appreciated. This engine will be sold to benefit the family. It is in the Cleveland, Ohio area. Thank you !!