best part is you can do exhaust work without a jack! don't expect the car to hook up when launching it with air shocks/shackles or stop when you need to if wet out! I had both setup's. my 69RR was lifted with shackles,airshocks with extensions, 323,8 3/4 n50/14 positrac tires and air shocks it would just spin the tires if you tried to get off the line quick,my 66belii had an extra leaf added D60 391 L60/15 torque twisters, 90/10 monroe shocks in the front, it would rip the asphalt it hooked so hard and then pull a front tire going into second. air shocks/shackles garbage imho!