A/C System on 4 cyl swap?

You need the low pressure line to the drier (which is all one piece), the compressor, and the hig side line to the condensor. While your at it, flush the remaining lines, condensor and evaprator and convert to 134A.

Not that hard, just takes a few dollars. I would also recommend that you add an inline filter in case the compressor goes south, or the drier explodes.