I know what you mean about exhaust bolts.
I bought some camaro stock 6.2 exhaust manifolds on the cheap. Then drilled out those small hole they put on each end. When it heats up the tight fit bends the bolt. So the paper clip bending trick after 75,000 miles.
I covered the head in aluminum foil tape and welded a nut to extract the broken bolts. That keep the BB's at bay. X2 on the
https://www.summitracing.com/parts/arp-134-1202