1964 Dart Owner - In Over My Head

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So I've been a bit busy lately and finally was able to work towards getting everything back together. Had it all going really well but realized that the third bolt that holds the two manifolds together is going to be an issue. (The lone bolt hole that is closer to the engine.) The new exhaust manifold is threaded for a 3/8 stud that uses a nut to sandwich the two manifolds together. The intake manifold hole which isn't threaded just a hole that the old bolt slid through is only large enough for the 5/16 bolts that were the original size. Do I have much play in that area to drill it out to accept the 3/8 stud or is there an adapter option that I can use to make this whole shebang work?

Wife will kill me if I go and tell her that I now have to order a new intake manifold as well :D
 
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