Gen 3 Hemi's have pushrods.the cam moves the lifter connected to the pushrod that moves the rocker arm that moves the valve. maybe you should not give engine advice.Technically "rods" in the 5.7L Hemi are piston rods so I think you mean lifters. Some engines do have push rods for the lifters but the modern Hemi has rocker arrms and lifters rather than push rods.
Anyway, there are several suppliers/vendors who specialize in Mopar parts. But in your case you need some technical expertise to go along with the parts. I recommend Modern Muscle Extreme (MMX). Dave Weber at MMX has years of experience building Hemi engines.
MMX Modern Muscle Xtreme