Think I might need longer pushrods..

Hey guys, I just finished my 5.2 magnum in my wagon and it has a lot of valve train noise at any rpm. The cam I used was a reground stock one and I just reused the stock pushrods, so I'm betting that is the issue. I've talked to the cam grinders and they sugested a .050 longer pushrod. Could anyone lead me the right way to getting what I need?