Clutch fan vs derale single 2400cfm fan

There are others with far more knowledge than me about this. They will get in here soon. I run the FBO ign. Stock Mopar dist, FBO module, bypass the ballast, 1.5 or 6 ohm coil and have FBO's limiter plate in the dist to limit total advance to 34°. The vacuum advance is adj to FBO's instructions. I do have aluminum cyl heads, trick flows. Like I said earlier, every combination is different.