If you plan on swapping cranks you should have the line bore checked. Even with swapping the same crank from one block to another it is good to have that checked when rebuilding an engine. The line bore can be off. I have personally run into that issue when swapping cranks. The factory is not built as close to tolerances as you may think. The misalignments can cause Cam to crank gear issues as well.
God doesn't like ugly.
