First Engine Build

I've been reading up on rocker arm geometry and I have some questions regarding my engine build. Hopefully, my engine block and components will be finished at the machine shop soon. I selected a Voodoo 703 hydraulic flat tappet cam, Comp Ultra Pro Magnum rockers, and Keith Black 243-.030 hyper pistons for my build. Cylinder heads have been worked over and valve stem heights checked. Calculated compression ratio will be 9.5:1.
I Know that I will need to measure for correct length pushrods for my application. I've been reading about using shims on the rocker shaft pedestals to achieve proper geometry. Do I need to concern myself with shims if I will be getting a custom length pushrod? I would also appreciate any recommendations regarding manufacturer selection.