Have you pressure tested the manifold? There is no point in working on it until you know it is leak free.
However, when drilling out broken bolts we recommend bolting up the mating part to use as a drill guide. Since your flange is broken you'll need a new one anyway so when it arrives - - and if the manifold is proven not to leak - - you can drill it out then.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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