Rear gears with sst a41

hello all sooo hopefully I didn’t make a mistake.
I am building a 68 dart. I purchased an sst a41 for the 4speed option and easier hwy driving. My thinking was I could run 3.73 out back to wake up the small block off the line but cruise with moderate rpm at hwy speeds. Rear is already rebuilt. Trans is not installed yet. The final gear for a41 is .7