few new guy questions.

ok here is set up i am thinking, hughes rockers and push rods,

this cam
http://www.summitracing.com/parts/CCA-K21-224-4/

these heads
http://www.summitracing.com/parts/EDL-60929/

So will it work or will I need something different? maybe different springs?

The springs, retainers and locks that come with/on the heads would work with that camshaft. The Hughes rockers and pushrods would also be acceptable. There are hundreds of combinations that would work and the one you are leaning towards IS one of them.

500 HP? maybe yes, maybe no. Edelbrock's top end kit #2087 comes with a larger cam and they rate the kit at 482 HP.