skinny front tires.vw size

My car has a bigblock street strip duster.I wanna run the skinniest tires on the front I have 15x4 welds.hooker 5205 fenderwell headers.concerned about the speed rating and weight rating I wanna eventually run low 9s or faster.my car is certified to 7.50 1/4 mile the rear right now has 30/10.5/15 mh racemaster slicks.