Blockstate JSON

{
    "variants": {
        "facing=north": { "model": "modid:block/your_block" },
        "facing=south": { "model": "modid:block/your_block", "y": 180 },
        "facing=west": { "model": "modid:block/your_block", "y": 270 },
        "facing=east": { "model": "modid:block/your_block", "y": 90 }
    }
}