Would not use bolts. The threads of the bolts will leak where the bolt threads into the block. This is a chronic A4 leak site.
Studs and nuts are the way to go. Buy the studs from Moyer, use stainless set screws, or cut up some all-thread. Clean the threads in the block, then use a toothpick to put JB Weld into the block and onto the ends of the studs.
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