What Jets? 670 Holley

My timing is out of whack as well for sure. At 10 base, i have 50 advanced. I bought the summit dizzy with the ecu as a kit and am trying to see now if i can adjust the dizzy at all. Setting my base at 0 puts my advance around 38. I realize this is also a problem, just the jet question popped up first. lol its been about a year and a half since this engine was put together, so my memory is a little foggy. I believe it was bored .040, comp XE256H cam, mild head work, I believe I had the larger valves 2.02 1.60 installed in the heads. Weiand stealth intake. Start at a stop, put the foot to the floor and it is lazy coming up to speed, no umph so to speak...anyone know if the summit dizzy can be adjusted with a heavier spring?