The 9.4 is right up against the "rule of thumb" of 9.5 for iron heads. As posted there are a lot of variables. It doesn't sound like you have quench so the 9.5 is really an upper limit - max under ideal circumstances. I think you would be better off with the bigger cam to limit detonation potential. That may allow you to run a more aggressive timing curve which is more valuable than the last couple .10's in CR.