GEARS

Hey everyone .

I got my hand on a 1969 Swinger 340 4-speed and currently getting her back into shape. I have 3:23 gears in the 8 3/4 . I have heard that I would be happier with the performance with a gear change. Some guys told me 3:73 would be the perfect choice.
Any thoughts or experiences would be appreciated

Also looking for an original 340 4 speed shifter handle if there's one out here

Thanks and have a great day !