440 valve rocker arm shaft questions

i just finished rebuilding a 440 with a set 906 castings mild porting. The heads were milled about .005 to clean them up. The block was also mildly decked for cleanup as well.

I am using a Hughes .530 .536 lift camshaft hydraulic flat tappet type. Can I use the stock rocker arm assembly? Any advice on push rod size and how to measure for length?

Thank you in advance for any help on this