Re: 85 200 hp black max carb
WH series carbs, the only adjustment is float level. Mix is controlled by changing jets, only recommended for altitude changes. Of course if you start grinding on the ports, shaving the heads, etc, you may have to change jets to compensate.
That said, carb gasket kits are cheap, as is a fuel pump kit. The carbs have quite a few fine passages that can clog up, and they will gather up any debris that escapes from bad hoses, etc. Well worth going through those items, as well as replacing any tired hoses and the fuel filter.