Times seem good to me. To really affect your 60' times you need to change to a higher stall converter,I like the yank 2600, but there are several good choices.
90 mph and a tall 14 is good for a truck that is basiclly stock.The 27" tires with 3.42/1 rear give the same overall gearing as 3.73/1 with 30" tires.