I think you would be fine with the 4.30s if thats what you want. Yet, I think that the 4.10s would satisfy you for daily driving. Thats what I had in my WS6. I considered putting 4.10s in my Cobra, but there is no way I could put all the power to the ground.

 

I went with 3.89 in the new rear. I tried 4.10 and thought If I ever got a good run I think I would bounce off the rev limiter. You should shift at 6300 RPM in every gear.

 

I have 4:10s in my bolt on Z28 w/cam and can barely keep the tires on the ground as it is. I think 4:10s is all you need.