squeezing more hp

i have a 73 duster with rebuilt 360 with edelbrock intake and hooker headers and 600 edelbrock carb also pertronix ignitor coil and ignition what else can i do to squeeze some more hp out of it i think i have about 360 hp now does that sound about right for what i have, it was suppose to have 300 hp with rebuild only and not adding the above? thanks