Thank you for your response Bear
The engine builder sells me the pushrods, rockers, lifters and cam. I will know which parts are exactly used in January, until now I only know the specific camshaft and that he uses the stock ratio. Maybe I'll ask him to sell me a set of 1.65 rockers as well just to be sure to have the correct parts that I can change if I feel I want to try it. Probably after the engine has been driven a while and I go to the dyno I'll ask for 2 runs and change the rockers for the 2nd one.
I sometimes read that people like to "overcam" their Pontiac engines and for example Speed Pro recommends to use the smaller cam if there are 2 choices that look good. So I'm happy with my choice because I can't easily go smaller if I install the bigger cam, but with the rocker ratio I can go a little bigger after I installed the smaller cam.
The Scat connecting rods have already arrived, they look nice
I will have a much better feeling everytime I reach higher rpm's now.. no matter if stock ones would have worked.. the $ 500 are a good investment for a comfortable feeling instead of being afraid to crush a "almost" new engine.