I have a 383 in my camaro. It is with Edelbrock performer RPMs, and custom dished JE Pistons. Still needs to run on premium though, (91 octane here) My motor is putting out more than 430hp I believe. This is my cam, Crower cams 224HR232 hydraulic roller (INTAKE: Duration: 286º, EXHAUST: Duration: 294º, INTAKE: Lift: 0.519, EXHAUST: Lift: 0.54, LOBE SEPERATION 114º) With 1.52 ratio roller rockers.
And my heads are fully ported, dual springs etc etc. You say you are gonna be running AFR's. Those are a much better head than what I have got, so you should be quite beyond 430hp.
<a href="http://atlas.walagata.com/w/artfuldodgerv2/AAAA0017.JPG" target="_blank">68 RS</a> : 383, performer RPM heads, Victor Jr. Intake, Holley 780 DP, Crower 224HR232, 700R4 trans, 4.56:1 10 bolt. - driven every day