Help me make this 88 gt handle better

[RoushRacing6N17]

I just test drove an 88 GT that I want to buy. It has big 29inch slicks on it and really little tires on the front. When I drove it the steering was really loose and sensitive. I know that I need to pull the slicks off to make this a daily driven car, but what else can i do to tighten this thing up and make it more responsive? I can go with a little wider tire on the front 15X4 rims, and I plan to downsize the big 29 inch tires on the back when i go to street tires. Will this tighten the car up? thanks in advance guys! This car is badass, 418 horses! Hope I can get it like I want it, I've never had one quite this fast.