Hey,
With 490 marks, you may get a rank between 45023-51086. You can check it here https://medicine.careers360.com/articles/neet-result-marks-vs-rank
If you are from outside Karnataka, it is difficult for you to get a private medical seat in Karnataka as last year it closed around a rank of 17839. This corresponds to marks between 561-570. You will get a private dental college in Karnataka.
If you have a domicile of Karnataka, you will get admission into following medical colleges-
To know more about Karnataka cut off, check here https://medicine.careers360.com/articles/neet-cutoff-karnataka
To get a list of colleges in which you have a chance of getting MBBS/BDS seat, you can use NEET College Predictor https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer
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