PM Jay Allen over at Hardcore50.com. He loves to use big heads (TFS R, ported TF Street Heat, AFR 205, Vic. Jr., etc), big manifolds (TFS R, Vic. Jr., Vic. 5.0, etc.) and big exhaust systems (1 7/8" headers and 3" exhaust) on small CID applications. I think he'd want you to spin the motor to atleast 6500, and probably something close to 7000. Obviously, you'd need a much steeper gear to do that. And, he'd probably want you to change over to a mechanical flat tappet cam, which would mean that you have to adjust the valves every so often.
Joe