quick power

whats is something i can do to get more power out of my 440 without overhauling it it already has torker 2 intake lunati cam eddy 750 a nice ignition what else is ther i was thinking of a underdrive belt system or something but i dont know does anyone have any ideas price really is no option but i dont want to over haul it till this winter when i do that its getting indy heads a more radical cam and some wicked pistons but i mainly just want something i can reuse but i dont want NOS.what all have you tried?