Roller camshafts?

I was looking in to get a roller cam and lifters for my 383 cid.
If I choose to go with a hydralic roller what does that mean to the rocker arms, do I need adjustable rockers or...?
Please, school me on this issue, never worked with rollers before.
I bealieve my flat tappet cam went south, I´ll have a closer look tonight.