Use a smaller bolt than the tubesize but SHLACK it with RTV silicone gasket maker (that gasket in a tube stuff). I just finished doing exactly that not a few hours ago. You can actually pull it out if necessary but the RTV keeps the bolt from going anywhere.
Good luck.
Oh yeah, it is a major exhaust leak and I would recommend plugging it.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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