Rear end options

I was also told that the 9" rear end was "heavy duty" and "indestructible". The 340 I'm putting in is bored .030 over with 10:1 compression. The intake manifold is an Edelbrock high rise with an Edelbrock 650cfm carb. I'm not sure what the gears are in the 9" rear end. I suppose that has a lot to do with whether or not the engine has enough horsepower to turn it.