1/4 mile ET guesses

15.28 @ 87MPH

I bet if you weighed the wheels and tires you took off and compared that to the total weight of the wheels and tires you put on you will find that it is a wash.

28" tall tires with a 3.91 = 26" tire and a 3.55 gear

I bet the original tires on the back were closer to 25", so the original 2.76 was closer to a 2.85 gear on a 26" tire.

The overall gear change was from 2.85 to 3.55 or .70 ratio difference.

Guessing here:
60ft = 2.08
1/8mi = 9.73
1/4 mi = 15.28
1/4 MPH = 87