You do have a choice, but it's when ordering the cam. Tell the. You want a intergrated cast iron gear on it so you can have regular intermidate shaft (though I'd run a harden shaft).
It depends how radical you go. Most cam grinders won't do that when entering that zone. There was a thread about that if you do a search. I thought max was about 550 lift and 230 ish @ 50 IIRC for that gear and not using brass.