solid vs roller solid cam

out of all the modifications ive done to my stang, i havent ever had a 'new' cam.. so my question is simple. i got a lunati .548 its not a roller cam, but when i put the roller rockers in the gap between the cam and rocker is a more appropriate distance, i bought a new set of factory rockers that seem to be loose, as in i can simply push them off... what should i do? and what happens if i run my rollers on that cam?