194674

The highest number possible is 127. The reason for this is:
You want the highest score on the left. So, use the largest numbers possible. 7 is less than 8 and 5 is less than 6. These are the largest tens digits possible. Next, we move on to the units digits. 1,2,3 and 4 remain. It doesn’t matter which numbers you use, as if the tens digit is larger, the number will be larger. To get the highest score possible, we will use 3 and 4. Our result is:
74 < 81
53 < 62
74 + 53 = 127
Our answer is 127.