1989 la 318

If it's not a magnum engine you can use your old 340 cam.
If it's a pre magnum engine then it's a LA small block.
They put roller cams in the last of the LA blocks, but that does not change the fact that you can use a regular hydraulic cam in it also.
I forget what year they started using roller cams but it doesen't make a difference.
My 1994 commando crate engine had a regular purple shaft cam in it, but has the newer block that can run a roller cam set up also.