Hi,
I've got a 66 and it only has 10 bolts to hold it on.
BUT BEFORE YOU TRY TO UNBOLT IT GET SOME LIQUID WRENCH ON THEM TO LOOSEN THEM OR YOU WILL BREAK THE BOLTS OFF.
The first time I took mine off for fun the second bolt broke off. Did the liquid wrench but the 3rd one wouldn't budge. So, I took a small torch, heated the head of the bolt, hit it with a hammar, and they all came out in less than 15 mins flat.
Grease the new bolts before you reinstall a 66 windshield frame.
Good luck with the spot weld remover, those suck.
Chris