You need knurled shoulder bolts like these.
https://www.ebay.com/itm/ARP-Standar...-/331358870909
Your local parts emporium will have them.
You might need to play with the shims. They make half shims too. Parts store again.
Starter brace goes on the end of the starter. It helps sometimes but try correct bolts first.
A thread on the brace. You can actually make one from a piece of angle iron but they are available. Parts store of course.
http://67-72chevytrucks.com/vboard/s...d.php?t=492532