XE268 and XE274 cams

I have the XE268H. LA/Magnum hybrid 360 +.040, KB107's 10.58 to 1 compression. roller rockers,M1 dual plane intake,1" spacer, 650 Speed demon,long tube headers, MSD 6AL and billitt dizzy. This combo gives me a little over 400 HP/TQ. Runs on 91 Octane

Jack