As mentioned any small block k will work from 68-72. 67 will work also, but 67 has provisions for a 1 year only pitman arm. That's an easy fix. Depending where yours is cracked it could be an easy fix as well. As mentioned the factory welds were pi$$poor on these. You should have whichever k you go with "redone"
Good luck! Beauty ride too! :thumbsup: