Take the dist apart and clean it. Set the initial timing per a vacuum gauge, Then read what the engine wants for initial. then change the mechanical in the dist, to be all in at 2000 or less, and limited to the initial plus whatever to 36 degees+ or-.
Then hook your vacuum advance to ported. You want that 50 degrees that the vacuum gives you at cruise , steady throttle. When you push on the gas pedal, the vacuum advance starts dropping out, as the vacuum in the manifold, and carb(that's why ported) starts dropping. At WOT, no vacuum=no vacuum advance, zero vacuum ; it drops out.