Big block camshaft question

Hello Chaps,Just wanting to ask and it probably has been asked on here before but...
Are all the big block 383,400,413,426 and 440 camshafts interchangeable?And question number 2,What are the advantages and disadvantages of running a roller cam,and advantages of running a solid cam im a little confused ie.with the solid cam are you always adjusting rocker gear?
Thanks again for youre imput much appreciated
Daveo