Quote Originally Posted by IC2
If you have white insulators on the plug, you are for sure too lean. This is a major contributing factor to pinging - not enough gasoline in the fuel/air charge, leading to too fast a burn rate which is the ping. The DuraSpark just make a better and cleaner spark source - though you do need to open the plug gap and maybe go a step cooler. The AFB's are really Edelbrocks in disguise and most if not all of their tuning kit will work, regardless of the fact that E-brock says it was 'modified by Weber'. But, if you have lots of Holley parts, then change it out. A generally stock 302 only needs about 525cfm or less!!
Run 10 deg initial. start wth 62's in the carb & an 8.5 power valve. When you changed to the durasparkII, did you open the plugs up. You need to run 'em at .045 - .050 to get the advantage of the DII bigger spark.

IC2 is correct. if you look any of the formulas for determining carb size, a 302 at about 85% VE, max rpm of 5500 will need a 408 cfm carb. All the more reason for me to go out & get a 390 holley & see what i can do