Mixed ratio roller rockers?

In a race engine, with the package well engineered to make power at a specific rpm range, there are advantages in using a faster rocker on the intake or exh. For the vast amjority of street or mixed use engines, using the lower rocker ratio is the smarter choice for longevity, and specify the cam to get the lift and duration you want. Rocker ratio can have a small affect on valve motion. But they wont make or break a street engine. You can have a much greater affect by chosing the right cam.