360 Magnum building on an existing bottom end

So I have the intake and carburetors and the ignition bits. Does anyone have a preference on head or cam choice for this build. keep in mind that budget is a factor. I saw close to what I want to build on a web page called Dyno proven 360 packages, Package 9 is kind of where I want to be.
It states (360 rebuilt with 10:1 compression flat top cast pistons, original crank turned .010"/.010", rebuilt factory rods. Factory windage tray installed. 2.02" heads with competition valve job and ported to flow 260 cfm. Intake, port/gasket matched. Holley H.P. 750 (.076" front, .080" rear jets). Large 1 3/4" primary tube headers. Comp Cams 305AH-8 camshaft with .525"/.540" lift and 305/312 degree advertised duration, 253/260 degrees @ .050", 110 lsa, installed at 108 intake centerline. 495 h.p. @ 6,000 rpm 500 lbs. of torque @ 4,500 rpm)
I realize this isn't exactly what I'm building, but with the motor being almost full roller with the tunnel ram and dual carbs, I think I can hit or exceed those numbers. I also planed for 3.73 gears in the rear end. Do you think they are to low or not low enough, considering it will be mostly a street show car. I am building it in a 60's Gasser fashion.