Lee, the "non-op" is a CA thing for the republik of Kalifornia....... No other state will likely care...... it's all do do with the bean$$$s!!! No non-op? A CA buyer would owe for every year no reg'd...... Out of state buyer? N/A!!!
Again, from what I have seen, $400 is right in the ballpark for a car that is this complete and matching! Go back and check the window markings! It has the original windshield in it and it looks really nice!
Like I said there are only a couple of little things to tweek and you are top of the heap! Go back to the mess of a 351C powered car that hit the auction block a couple of years ago.... it was 100% stock, never seen a car so original...blah blah blah.... Even when multiple owners etc chimed in to the auction co, all that happened is that comm's from the auction house ceased and the stupid bidders came out and ran it up to something like $329K???? That number could be off by $50K or so......but it was ridiculous for such a NOT stock car!
When your car is finished it will be work MIIIIILLLLIONNNNSSSS! 
))))
Steve