seized engine

So my 78 xs400 has a seized engine so I went to pull off the cylinder head to manually rotate the pistons but before I could get the engine apart almost all my bolts broke in half or completely stripped. The worst part is I have no idea where to get replacements. Anyone have suggestions?

Hi All, Have been using this forum for a few months but only just made an account - because I ran into a problem. Hoping for some insight - I love to learn so bring on the knowledge! I bought my first bike, a 1980 xs400s, in July. Classic story: it had been sitting in a garage unused for...