Depending on your mechanical ability and tools, you should be able to do it. Lots if people change them, but you will have to get an alignment afterwards for sure. Also depending on how low, you may need some other components to keep the geometry correct.
chevy runs deep, Don't step in chevy!
289 - Holley 4150 570cfm; Performer intake; mild cam; MSD HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.