will this wheel and tire fit with stock suspension?

the 15x8's with 4.5" back spacing will work fine. I ran some on my 93GT with no trouble at all. I was running 26x10.50 MT ET Streets. They looked right at home on the car.

As far as flipping the quad shocks, I'd just take them off completely. With the sticky tires, wheel-hop usually isn't an issue. And that's the main purpose of the quad shocks anyway. I've got a bad wheel hop issue with my 03 cobra now and even after swapping out all the bushings and such like everyone says to do, it's still there. But with a set of drag radials, the wheel hop is practically gone.

Also, I don't think you'll have to mess with the quads. I beleive they will clear anyway. Just in case you run street tires on the welds.

I was running a complete UPR rear suspension with uppers and lowers, and an anti roll bar. Had a 438ci dart based windsor with pro 1 heads, a pro fogger NOS kit and a cheater plate NOS kit. Leaving on the plate, I was able to rip off some 1.40's 60' times. Usually leaving on the motor, I would run 1.50-1.55 60' times.

The MT ET Streets are a great tire in my opinion. Not really a street tire, but they do hook.

Yes, I ran mine tubeless. Some people run them with tubes, but I never did.