Gear Ratios

More information like what kind of engine you have, tire size and type of car would be necessary.

You get most of the engine speed reduction using the 3.55 compared to the 4.11.
The gain between a 3.55 and a 3.36 is only about another 5%.
Based on the 1950 Chevy Specs the engine speed at 60 mph with a 4.11 is 3120 rpm.
That drops to 2700 rpm with a 3.55 rear axle. If you could fit a 3.36 into the 1950 housing the engine speed would be 2550 rpm.
Plus you will definitely notice the decrease in acceleration and performance going up hills with the smaller ratios.