when changing my oil in my 57ranch wagon .I saw the many nook & cranies that air could flow into. I used simple brackets to make a air dam out of plastic lawn divider.I attatched this on core support, making it the width of wheel track. MILEAGE WENT FROM 18.23 TO 19.88 AT 65 MPH . 351w holley AOD 650 ,4;11 rearend The spoiler is far enought back that it does not show . Give it a try
Pics please
sorry I don't have any way to dp photos. It is real simple "bolts to core support with afew simple brackets. A little triming and be sure to extend out to near wheel width. [it will bend at speed] simple