We run a 525 BBF with a 4.5 bore, 4.125 stroke and a 1.5 rod ratio in NMCA Extreme Street. If it works fine to the tune of low 8's shifting at 7500 RPM.
Your just fine and you will enjoy the power. If you can find a set of used Blue Thunder heads that would be a nice upgrade for you. Much better than stock and when fully flogged on the bench will flow 393 CFM on the intakes. A used set of Cobra Jet heads would be a nice upgrade as well.