Need help adjusting rockers on a tbi Chevy?

[ksephoenix08]

I have a 91 Chevy 2500 that I recently done work on the timing. I placed a roller cam from a 99 5.7 Vortec. I'm almost sure that I have it timed correctly, but the valves seem to not open all the way. I still need the rockers adjusted. Does anyone know how to do this step correctly?