The C6 consumes more horsepower than E4OD plus you'll give up the overdrive. I used an AOD in mine, there's no way with a small block, basically stock, you're going to hurt the E4 unless you run it with the throttle valve out of adjustment. Especially with such a light car. A friend of mine doesn't even run a cooler! Not that I agree with him but.. the cars are light and the trans are really tough.

I was just remembering, some cars today don't even have a dipstick, the trans are sealed and you run them 'til they drop... what ever that means! 100, 200 , 300 thousand miles?? As long as you don't see leaks, good to go.