I've run Stage VI heads since the early 90's. At the time they were the ONLY moderately priced aluminum big block head..... but the time you got them fixed and hopefully didn't get a porous set you usually had more into them that you ever wanted. I've seen a few sets go nines and mine have helped my Mirada go 10.0's at 134.

Dwayne Porter is THE MAN for the stage VI heads, although he does laugh that people still call him and ask about them...... there are so many better choices out there now.