If we have a look at the marks vs rank analysis for CLAT in previous years, then the data which suits your case the best is as following:

70-75 marks: 1412 - 2318 (estimated rank range for the given marks range)

75-80 marks: 744 - 1411 (estimated rank range for the given marks range)

80-85 marks: (estimated rank range for the given marks range)

So, with this data, you rank can be around 700 to 1,500, which is a great rank!

Also predict your college with the following CLAT College Predictor:

CLAT College Predictor

Hope I have answered your question. All the best!