What years?

LA 318's had roller cams from '85-91. Flat tappet LA 318's were still made '85-'89 though, not sure what got what. '90-'91 was rollers only.
LA 360's had roller cams from '89-92

Info from this casting number list.
mopar casting numbers

I'd heard the 318 rollers started more like '86, and again they made both and I have no idea what the breakdown was like, car vs truck or whatever.