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Hi John,
I will not pretend to have the years of experience that many others here do.
But.. I had to re-build my top end last year so I went through some of what you're working on.
I would recommend gasket surfaces be as clean as possible. That way you are likely to avoid air leaks that could drive you crazy when you try to get your idle RPM's under control.
As to that angle.. yes. The carbs on a 350 angle slightly outwards. So what you show is correct for the left side carb.