Cam identification, conditioning, re using.

Ok, so I can say that with all the engines i have ever built, I have never reused a camshaft, that was the reason I had to rebuild a few.

So i have a very stock 75 318 with what I believe us the original cam.

I also have on the other corner a 74 318 that i have reason to believe the cam is aftermarket and probably a more desirable performance unit but the block is trashed.

1. How do I identify a camshaft to find out the technical specs

2. If the one out of the 74 is something good, how do I recondition it for further use, the lobes look strong but there is a little discoloration and Mark's from the lifters but not bad.

3. How do I identify which are the proper new lifters to order

4. How do I know if the stock spring's are right to use.

These are my "acting brand new here" questions for the day.

Thanks