I am NOT a carburetor guy...period. They baffle me. But I need to re-jet the Holley in my Ford. When I bought the car, it had a worn-out 390 FE motor wit a brand-new Holley 600. I sold the FE, kept the Holley. It's on my box-stock roller-cam 5.0 small block now. The engine runs great, but rich...