hooking with 26" slick

Looking to buy new radial slicks for my duster currently running 71 duster 451 big block auto with 3:73 gears have mono leaf and caltracs with adj shocks 6 cyl springs and 90/10s was running 11.50s @119 mph with 28x8.5 slicks want to try 26x9 to help with small gears but am worried about not hooking anyone run them with similar times/set up? Current 60ft times are 1.7