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I have two sets of cylinder heads. I'm trying to figure out what they are. One set is new and bare. The other set is used and complete. I thought they were the same thing, but on closer inspection, they seem to have several differences. I do not currently own a GN, but plan on buying...

I'm comparing the GN1 Performance Extreme FMIC to the Big Boy FMIC. The Extreme is 24x11x3 and rated to 800hp. The Big Boy is 24x12x4 and is rated 500-1000hp. They are the same price. Is there any reason for me to not buy the bigger one for the same money? Or is there a better choice out...