I don't know. Relative to other cams its size, the OE resto cam has late intake valve closing, early exhaust opening. In theory, I think you need pretty high compression, and it kind of lends itself to high rpm operation in 383.

I use it. It's trouble-free but not spectacular. If I try another, I will use something that closes intake sooner and traps more cylinder pressure, like old single-pattern Comp 268H or Erson tq20h, or a copy of something like that.

Well, since you are changing to closed chamber heads, see what it does with increased compression before you change cams.