i think its blowed

Steel rockers are usually around 1.45-1.49:1. Not quite the 1.5 they spec. The Cranes will be closer to 1.5 dead on and more consistent. Also, steelies are pretty forgiving for geometry. Rollers might be more of a challenge. The problem is the geometry on a shaft system is only affected by the valve job. Pushrods dotn do anything for it. The best way to tell is bolt them on and see how the sweep is. For a start, you can measure your existing pushrods. Then order that length but with the cupped end on them. There should be a few choices of brands for that. Then check the sweep with them. Chances are you'll be fine. If not, search geometry here. As there has been a few threads in the past few months on this that covers it well. Stability up top will give you some power adn mroe important, no more holes...