The studs on the exhaust manifolds on my 66 140/PG seem to be crap - nonexistant. If I was going to the hardware store to get some bolts, nuts, jam nuts, etc. - What would you folks recommend for size/material of the bolts/nuts? I am looking for an easy way to attach the manifolds to the mufflers (or is that mufflers to the manifolds..) Mike in Altanta