Yes, you can get seat with 273 in BAMS under state quota i Kerala and also you can try in private colleges. 

It's the first time that neet is giving admission to courses like bams and bhms. Expected marks will be somewhere above 300 to get a bams seat in my knowledge

Try your luck.

All the best for counseling.

To know which college you will get through try this rank predictor https://medicine.careers360.com/articles/neet-college-predictor