[briankmagby]

Thanks A Snake, I hear you about the emissions, I'm not worried about the air, I'm just worried about getting my Cobra registered. I spoke with the people at the DMV about it and they told me that the deciding factor on weather the car has to pass emissions or not was based on the year of the engine. I told them that I was going to build my own engine and that I would be using different heads and intake. They said that all I need to do is make sure that the engine block was a 1967 or earlier and I would not have to worry about it. They said that I need a document on Ford Dealership Letter-Head that showed the engine code and verified that the engine block was a 1967 or earlier. If I provide that, then I don't have to worry about emissions, I just show that document each year that I register it. That should be easy enough as there should be plenty of 1967 or earlier blocks to be found. So I just wanted to check to see if there were any real differences between the blocks between 1961, and 1967 that I should look for. Ideally, I would like to find a 1965 block since I am putting it into a Factory Five 65 Roadster. Anyway, are there any real difference between a car 390 block, and a truck 390 block? What's the difference between the 390 and the 391? At least I think I’ve heard of a 391 FE. Thanks for all the help.