I think I need more cam

I have a stroked out 340. Lots of aftermarket parts, well all of them except the block. But for some reason I picked out a cam with .495 lift, 235 duration @ .050, 3000-6000rpm range.

I want more rpm. What kinda rpm is safe for a stroker. And what size lifts are alright for one. I'm having second thoughts before I degree in my cam. Any help or suggestions would be appreciated. -Derek