Hello Aspirant,

It would be difficult to tell you the exact as JEE Main is being conducted twice by NTA for the first time. Based on your score your probable percentile will be 76.8 to 78.8 and your probable rank will be 240,989 - 270,989.

NOTE:  The Overall Rank Predicted is on the basis of the expected total number of students i.e. 1152650 appearing in the JEE Mains 2019.

With this rank the chances seems less to get a seat in NITs. You can also refer the below given previous year cutoff for the reference.

https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-srinagar

Good Luck!