'63 valiant 4 door /6 cruiser questions.

Thanks 72Demon, I was actually thinking about this a bit, but as I have bigger fish to fry atm I was going to hold out. But a bolt on upgrade is always a nice thing. The engine is a stock rebuild I bought a few years back which I think I mentioned earlier, I was looking through my manual and noticed I'm missing a Large chunk that contains Camshaft info (found another manual online and ordered the replacement). How do I know what the camshaft lift is? If I ever decide to upgrade my camshaft for whatever reason does this nullify the head work I can do now without pulling the motor?