[Bobcat]

Agree 100% with what wtm442 said ... but want to add a few comments . Get rid of the plastic bowl plugs , they will give you a false reading on your float levels . The fuel will appear to be higher than it actually is . Go back to the old tried and true method of taking the brass plugs out and seeing where the fuel level is .... and it should be just at the bottom of the hole so the threads are barely wet . Check the level with the engine running . If you are worried about fuel spilling out , do a preliminary check with the engine off to see if it squirts across the shop.
Another good book , if you can find it is by Alex Walordy ... Carburetor Power Guide , Super Tuning Holley Carburetors ... old , but has some useful info .
On the Power Valve , I`ve seen the fiber gasket under the valve separate ( it`s a two piece composite ) due to the chemicals in the fuels today and provide a leakpath under the PV . It`s solved by going to the nylon gasket . I had this problem on my 427 two 4`s Galaxie .

Good luck