It is diificult to get ECE in one reputed nit with your rank as you are also from GEN category.So I am providing you some better nit with other branches and some good colleges with ECE branch :

NIT Raipur : Mettalurgical

NIT Silchar : Civil

IIIT Nagpur : ECE

NIT Sikkim : Electrical

NIT Rourkela : Mettalurgy

Sant Longowal Institute of Engineering and Technology : ECE

IIIT Bhopal :ECE

These are some best options you can get with your rank.Choose wisely.Good wishes!!!