Duraspark I Upgrade - Update

Was curious if any of you experts know how much the Duraspark I electronically retards the timing when the white white is energized during start? Thanks

Road tested her this weekend and put about 80 miles on her. Runs amazingly well, never better! Slight ping at WOT in 5th gear going up a freeway hill, should retard timing a tad. Last 8 miles or so was slowing moving LA stop and go traffic. Take a look at the pic with  #6 spark plug on left with Duraspark I compared to the #6 on the right? Not sure why #6 with my dual points system was the only carbon fouled one whereas the others looked perfect? Maybe the plug wire wasn't a good connection?

Another upgrade to Duraspark ignitions is to substitute the Ford TFI solid-state coil (the one that looks like a transformer from the next generation of stock ignitions) to replace the can-of-oil coil. This eliminates the common problem of coil overheating and rupturing if 12V+ is left on too long. There are a number of aftermarket coils that work the same but are more expensive than the Ford assembly. Note these coils won't make the engine faster or improve the spark, it just increases reliability.

Regarding the carbon buildup on plug #6, maybe do a compression test and/or leak down test on the engine.  If cylinder number #6 is different than the other cylinders then it would point to an issue other than ignition.