My block has the recessed threads mentioned here in this post from Ron:
New head bolts breaking when torquing
But someone used the short head bolts.
The date of manufacture is February 1999, where there is supposed to be the short head bolts, but the block doesn't have the threads going all the way to the top.
I have the long head bolts (stretch type) so I will be using those, but I have to make sure they don't bottom out.
I can't check this at the moment because the heads are at the machine shop.
Ford wouldn't use the short ones on the wrong block would they ???