Rear end gears for 7 1/4

I have 225/6 in my 71 Scamp (daily driver) and understand that this motor has a longer stroke and thus more tourque. I would like to get more low end performance and sill have decent highway car. I am wondering if changing the stock rear end gears in a 7 1/4 is possible and if so what gear should I use. I am not even sure what the stock ratio is for a 1971 w a 7 1/4 rear. How do I identify this? Any thoughts?