Where to start - maintenance on a 340

Figuring out custom ground cam specs can be a little challenging because the only real way is to pull it out and run it through something like a cam doctor or send it to somewhere to have it profiled. But it’s not really worth the effort. If it runs good and does what you want, run it. If it’s temperamental and the cam is too radical for what you want to do with the car you’ll be replacing it.