I can fit a smaller diameter bolt all the way through the hole. I may be able to just role with that,Take it to a machine shop and let them fix it unless that hole can be drilled out and put a bolt all of the way through.
Recent repair on a machine shop youtube channel I folow.
TThe Customer BROKE A Main Stud Off In Their BRAND NEW LS Block... (youtube.com)
I ALMOST Gave Up On My Customer's CAT Exhaust Manifold! (youtube.com)