355 gears. Or more ?

I have 3.55s in my 440 Duster. I like it. 295/50s in the back and she turns right around 3k at 60. It’s actually cruises better with the 28x12.5 racemasters on it but I’ve never had it on the highway with those. I don’t think you are going to have any issues with dead spots with 3.55s.