Add to your dependency list, fuel valve orifice size, ID of fuel valve, fuel valve height, fuel valve gasket, steel vs Viton tip needle, Ethanol vs Non-Ethanol gas, temperature and fuel pump pressure. I'm probably missing others. To make an even bigger headache, most of the carburetor kits on the market come from Asia. Quality and precision are suspect. As an example, some fuel valves don't seal well because of incomplete finish work during manufacturing. Staking may be required.
The float spec in the Rochester book will basically get you started. It is not uncommon to do trial and error on this setting. The air horn is usually vented to atmosphere in one manner or another. You can reuse the same gasket to do your bowl fuel level setting and measurement. It may leak a little at the gasket. Once you have a setting you want to test on the road, install a new gasket. Bowl gaskets can be purchased separately.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
