Do a search on cams e.t.c. There is a ton of info on OSO on upgrading the 502/500Hp motors. I have a HP 500 I am presently building & installing this week. I went with the139731 Crane cam(most like the 139741), bored out 509cu, cleaned up the heads a little & had 3 angle valve job done aswell. Merlin single plane intake, 800Holley with CMI headers.I will hopefully have her running by next weekend. I believe a blower is the best bang for your buck.