And may be the original poster just wants a fun cam that doesn't need "Battleship" springs or W2 heads to pump his 318 to 400+ horse. Give him a little rump, a little grunt, and reasonable economy.
Then he should follow the advice in post number 14.
Making way harder than it has to be. Unless he wants someone to tell him one of the cams he is looking at is a world beater over the others. So I'll add this.
Any of the cams you are looking at will work. The difference between them is virtually zero. The idle characteristics of them will be virtually in detectable. Horsepower will be plus or minus 2 HP.
There isn't enough difference in them to bother with all this blather.