I run basically the same combination and have a 6,000 rpm chip.
I've driven high winding small blocks before, and though I've never punched a hole into one, I've learned that going much beyond 6K doesn't add back much. And if you're not running a scattershield, forget about it!
What you really need to do is determine if your camshaft and intake manifold combo can effectively support much rpm above 6K. It may sound great and all, but you might be running out of "flow" by then and an overly rich/lean condition could actually be hurting you more than helping.
My two cents.....
-Deano