I found very little difference between 4.10 and 4.30 in my current NSS car as well. I think it will actually MPH a little better with the 4.10. Once the suspension is right either one hooks without issue. 10.5wx31 std 2.45 1st, 3340lbs. 1.255, 1.258 60ft this weekend before it broke the ring gear. It's been 1.240 with the 4.10.
Doug