I've also tried some "tricks" like filing the corners off the plugs, because I was so afraid of detonation. It didn't help and made the engine run poorly. I have tried Autolite 3923's and 3922's. I don't have 1/4 mile times or some other analytical data, but just seat of the pants impressions.
With Edelbrock heads, the Autolite 3924's with a 0.035" gap will work with 99% of combinations.
JMO,
paulie