Hi kshitij, 

First of all, candidates must secure a minimum of  50% of total marks to qualify MHT-CET exam.as you describe you have got 66% in Maharashtra board and 67 marks in MHT-CET exam, so the chances of getting autonomous college is quite difficult but not impossible because in a 1st or 2nd round of counseling many high percentage students got top colleges and autonomous college seats are becomes available for low percentage students.

So you must go through all counseling process and I assure you, you will get admission in autonomous college.