oil pressure

What are the cylinder pressure readings? Did the engine start immediately the first time you fired it? Who assembled the long block?

I only partially agree with the statement they can't be broken in "on the ground". While an engine cannot be fully broken in on a stand a properly honed and cleaned bore witha properly assembled set of moly rings will be almost fully seated before the cam break in is done. After that you need to place a load on it to completely seat the rings. But- if the carb was way rich, or it didnt fire, or the hone is too rough, or the bores were still dirty, or too much oil was used in assembly then it will take a while for them to completely seat, if they ever do...