If not a spoiler, a simple vertical fin on the front below the front bumper would suffice I would make it out of 1/8" aluminum paint it flat black, make sure it has 3" of ground clearance and that the front edge is no more than 30" in front of the spindle. I had a similar fin on my dragster nose and I have seen a couple of Willeys pro-mod cars with beam breakers like I just described.
