I want to adjust my rockers on my 468 BBC, but I don't know what the cam specs are, or even what manufacturer. It is a solid flat tappet cam, roller rockers. thats all I know. It has a small lope at idle-I was told it was a "mild" cam. I guess I could check the lift with a dial indicater, if that makes any difference. What is a safe setting for the valve lash? How about a cold lash setting to get them in the ballpark before I set them hot? Right now they seem to be at about 22 cold, which seems like a lot to me. The heads are iron 049s. Any opinions?