Roller rocker arms in a street engine

I know my small blocks well but have a big block question. A customer is having us do some things to his 69 Super Bee with a 440. He wants to use 1.6 roller rockers. What are there longevity on the street? Is there a prefrence between aluminum or stainless steel? He is running a hydraulic cam. Does any one make push rods for this application or do they have to be custom made? I appreciate anyone's guidance and experience.