When I was bone stock I ran an LS V8, not sure what year, and he pulled a half car length on me off the line and stretched it to one car untill we both let off at 80. Since my tune I ran one at the 1/8th in Seven Points and beat him by .610 and since then I ran another V8 on 31 and pulled two lengths really fast but I am pretty sure he had issues. I heard his car downshift and stutter for a split second and then it started to take off.
Many times I have pissed off 5.7 Chargers, 300c and as of last week a RT Challenger.

Ran many 4.6 Stang GTs and come out on top 70% of the time. On the other hand I have had a couple Neon SRT4s, WRX, Camaros and a G35 & 37 coupe whoop my ass bad and send me home with my tail between my legs. :lol:
Then there are the hard numbers.
LS8 0-60 7.1-7.5 (too many different ones so I listed fastest and slowest)
LS8 1/4 mile 15.4-16.1
VIII 0-60 6.9-7.2
VIII 1/4 15.2-15.6
So it seems stock the VIII is faster and hard to say who has the better tune but since the Mark has more power and is within 50 lbs all else being equal it should be faster. With both cars having gears and a trac loc that may change some as the LS has better weight distribution but the Mark can hold more tire so it can launch harder off the line. I have 275s in the rear, what can the LS hold?
Ah, interwebz racing at its finest. Dont take me seriously.