I was under the front end of my 70 Challenger and noticed that the front rubber bumpers seem to be making contact to the bump stops. This one is the drivers side and it appears that the rubber bumper is wiping the dirt off of the bracket. The bottom of that bracket is shiny paint like it is being wiped off.
If this is the correct guess, it it caused when backing down my drive and transitioning onto the street.

I have 245/60/15's up front and from the ground to the top of the wheel trim is 24-9/16". Does this seem too low? Do I need to crank up the torsion bars to minimize this?
Note: stock 340 torsion bars.

Thanks