How would you rebuild this 318?

You have a good collection of parts already for a healthy 318. If it turns out to be a bad rod I would just eagle sir or summit rod it along with some kb167 and a. 028 head gasket to get the compression up a bit for the healthier cam you are running.
If it needs to be bored, and the crankshaft is damaged, well at that point you are halfway to a 390 financially and not a bad thought. Then the heads, cam and intake would probably be substandard at that point