Help me with A833 Gear ratio choice wide or close!

I always figgured the 3x 1st was weak

Way back in last century, about 73ish, I swapped a low miles 340 into what was an otherwise '70 RR 440-6 car. Used the 18spline box factory, in the car. I don't remember thinking "it was a dog." That car weighed about 3860lbs, and had the 3.54 (Dana 60) gear. It ran about 3K RPM at 70 mph with G60x15 tires