I jumped the gun!

So I went ahead and bought the components for my small block 408 magnum. I just hope I don't get buyer remorse, but the gentlemen at summit (Frank) was very theral and explained everything right. I basically want at the minimum of 500 hp, and i bought this, and it will be a street driver with it seeing the track maybe twice a year(if that)...

Short block is already put together with 4 bolt main splade. I believe the compression is 10 to 1,

I bought:

COMP Cams Thumpr Retrofit Hydraulic Roller Camshafts-CCA-20-601-9
Duration at 050 inch Lift 235 int./249 exh.,
Advertised Duration 291 int./311 exh.
COMP Cams Pro Magnum Hydraulic Roller Lifters-CCA-8920-16
Crane Gold Race Extruded Rocker Arms-CRN-11759-16
I also have the Air Gap intake, but not sure yet which carburator to run-I have a double pump 600 holley, will that work for the mean time?

What do you guys think? Will I set my goal? Did I do too much or too little?

All help is welcome cause I sure am lost...thank a million guys.