What rocker arms would be best?

I use a lot of Hughes rockers and have had very good luck with them. Running a roller cam that needs 600# spring pressure, you dont want to cheap out on rockers. HS are also one of the best(save the T&D/Jesel for the all out race engines).

Another thing you need to look at is the pushrods. Go with at leats a 3/8 if you can