I thought we said no "H word" on the forums! Just kidding, they are really a pain, and it depends on heads. If E Brock heads, I'd go with Ford Powertrain Applications (FPA) and tell him what heads you have, there's are also a tri-y design, which is supposed to be better flowing. For more info do a search under my user name. Good Luck. I forget which rockers I got, they were part of first time build up, but stockers are not good for hi-performance (stamped steel). I'll have to dig out old paperwork. I do know they were readily available and not a lot of $$$. Good Luck.