I am new to the board and hope I am doing this post correctly, please let me know otherwise and I will glad to change once I know how. I am in need of some Buick nailhead knowledge. I am looking to buy a 425 nailhead, but it needs to be a 64,65 or 66 model. I plan to place it in my 1964 LaSabre to replace the 300V8. I need to know what the casting number 1384701 is. I have looked at several sites with no luck. The heads I found easy (1196914). There is a LW365 at the front of the block. The engine currently has a Super Turbine 400R behind it. I think this is a 1965 425 wildcat engine, any help would be greatly appreciated.