Hello aspirant, 

To secure a seat jnto top IITs one needs to score a rank under 1000 which are IIT Roorkee and IIT Kharagour.
This corresponding to marks of 300+ for IITs.
Majorly B.arch Admission happen through JEE Mains for all centrally funded Institution and NITs.
A rank of near to 3000 is must to secure seat into top NITs for Architecture. This correpnds to marks of 250+.
The ranks may vary as per marks on basis of difficulty level of paper, total Students appeared and gheir Respective performance, and previous year trends.
The cutoffs for various colleges shared below.
https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning%3famp

You rank is too high. You may not get any NIT