What is the differences between the 1994-95 5.0 and the 93 and older 5.0

[Raw Power]

I want a mustang that will be a good road racer, because I don't go to the track very often. I see that the performance parts for the fox body cars are much cheaper than the sn95. I'm leaning towards the fox body just because of the parts and the on board computers are better also. Here is a question, i've been reading muscle mustangs and 5.0 power and there was an article in there about surge problems during idle how many of you guys out there have had this problem.