gear size with 408 and 833

Dropping in a 408 dyno at 503hp. I have a 833 overdrive 4speed with tall gears. I'm talking under 3 ratio. I think 298?? ratio. Anyway, will this be a disaster unless I go to lower gears in the 8 3/4 or will I get away with it as a driver??:coffee2::finga::smile::cheese:;)