That said, Even if you "made it fit"" Lugging around the additional rotational mass of a 12" of slick when you might only need 9" is actually gonna slow the car down. That, coupled to the fact that at 28.5" the tire's gonna grow at the big end of the track. Grow enough to probably rub against the front leading edge of the quarter panel, and pinched onto a 7/8" rim it'll grow even more.
unless you have a fair amount of power, a 9" slick is more than enough for even a low 12 second car, Not much taller than 26.0 inches or you better get a hammer.
a 9" slick will fit on an 9-8" rim, 7 is the minimum