Super Jet exhaust manifold bolts

I have a b pipe manifold for a 61x cylinder. I want to put it on a 760 cylinder. Can I just drill out the holes to fit the bigger bolts or would it be better to use time serts?
 

BruceSki

Formerly Motoman25
Location
Long Island
either way is fine. time certs would be better if you ever want to sell the manifold. They are worth more when they stay 61x sized.
 
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