Help me understand rebuild vs crate?

The worst situation you can be in is you build it and it doesn’t run right. So you ask for help and people ask questions like what is the static compression? Did you degree the cam? Well the machine shop said it would be 10:1, the cam is straight up. The real answer is unless you measure it you DON’T know. You can measure it in the begining or after you take it back apart.