Unfortunately, there is no "cheap" 9" rear that will bolt into an A-body that will handle much power. 28 spline axles and small bearings will not last long.

There is a reason the common passenger car 9" weighs 60 lbs (not 100) less than a passenger car Dana 60

If you compare apples to apples, a "good" street/strip 9" rear will cost more, consume more power, and weigh about 25 lbs. less than a COMPARABLE Dana 60.