what gear ratio and what transmission/stall converter.
set timing at 18 degrees initial (without the vacuum advance connected).
rev up the engine and it should go to 36 to 38 degrees (without the vacuum advance).
buy an adjustable vacuum advance canister and set it to add another 12 to 14 degrees. Try running off the manifold vacuum.
after you set the timing adjust idle mixture for best idle.
get a holley 750 3310. junk the edlebrock
learn to read a plug and make mixture corrections