cam questions

[kenfyoozed]

ok im new to the engine rebuilding myself. i have always told a builder what i wanted it for and he built it. now i want to build it myself. im lost on what cams are good. What does a 260/70/80/90 degrees represent? and what should i look for when buying a cam. I read what most people use but can someone help me understand what you use for what reason.?

thanks

neil