gear change....possible gain?

Hi Guys,

as always i´m searching for ways to lower the E.T. for my 68 Valiant. PB for now is 11.61 with a 1.67 60 ft. and 115 mph, engine is a relatively mild 408SB around 450 HP / 727 trans 3500 stall / 3.73 gears and 26x8" tires.

I do have a 4.10 gear set, and think i have to buy new tires after the season.....so i thought why not put in the 4.10s, step up to 27 or 28 inch tires with 9" tread width.

Do you think there are any gains? or should i better keep the 3.73 gears?

Michael