NCHMCT JEE Scores

NCHMCT does not disclose the obtained marks by the students, however, NHMCT declares only the ranks achieved by the candidates. So, for top Central government IHMs like IHM Pusa Delhi, you should fall between the ranks from 01 to 425 as per this year opening and closing ranks for open category candidates.

I think IHM Gwalior is not a bad choice with this rank. It is a central government IHM. However, if you want to wait for the third round, you can. You can also check your position by using the following link. All the best.
https://www.shiksha.com/hospitality-travel/resources/nchmct-college-predictor

There are a few IHMs you can get. But admissions also depend on your reservation status.

Yes, you do have a chance in maybe a few central IHMs, most of the state IHMs and private IHMs.

NCHMCT 2018 College Predictor:
Use your NCHMCT 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges and rounds you may crack.
The result is based on admissions data of NCHMCT 2017.
Get resources and insights on colleges and courses.
https://www.shiksha.com/hospitality-travel/resources/nchmct-college-predictor

You are having a great rank. You can get IHM Delhi Pusa, Hyderabad, Chennai, Chandigarh or Mumbai. These are the top IHM institutions.

Based on your rank you are eligible for many central IHMs –
IHM Bhopal
IHM Bhubaneswar
IHM Chennai
AIHM Chandigarh
IHM Gandhi Nagar
IHM Goa
IHM Gurdaspur
IHM Guwahati
IHM Gwalior
IHM Hyderabad
IHM Hajipur
IHM Jaipur
IHM Shimla
IHM Lucknow
IHM Shillong
IHM Srinagar
IHM Thiruvananthapuram
Of them I would suggest you go for:
IHM Chennai, IHM Hyderabad, IHM Jaipur, IHM Goa, AIHM Chandigarh.

Here are a few you could try –
IHM Shillong
IHM Srinagar
SIHM Pondichery
SIHM Gangtok
SIHM Thiruchirapalli
SIHM Panipat
SIHM Yamunagar
SIHM Medak
These suggestions are based on last year's admission statistics. Please consider them as a suggestion only.

Which category do you belong from? If general, then there is no chance.

You can get IHM Bangalore, IHM Chennai, IHM Kolkata, IHM Lucknow, IHM Goa and many more.
Good Luck!