Gear ratios and driveability

Many, many moons ago, I used the stock 3.91's in my 383 Challenger R/T 4spd, around town, and swapped a 2.94 pumpkin in it when a road trip was in order.
I often wondered what kind of top end it had w/ the 2.94's. I redlined 3rd gear once, we was movin'! (Still had the 3.91 speedo gear.)
Of course, I was a lot younger and much more energetic then!
But, I digress...