I'm running the comp 275 extreme high lift cam in my cast crank 408 with ootb eddy heads. It seems like it runs out of steam around 5k or a little higher- runs real good around 4k. I wonder if anybody's got dyno or track #s for my combo. I was tempted to try a bigger cam but it idles pretty well at 950 and I drive mostly on the street...

Anyway for the OP, I do like my cam but just like everything else there are compromises.