There's a million variables there, tough to say.
Quite honestly with only those mods, you probably wont see an enormous gain.
With the upgraded springs in the head, I would want to see a larger lift camshaft too. And some form of short runner IM to take advantage of both the cams and head.
Or the turbo would really allow the head to shine as well. Fact is with the mods you've got now, the OE head isn't a big restriction.