4" of clearance should not be a problem if you watch where you are driving, I've had cars lower with no problem. Hey Don, in 30+ years of building, I still haven't built the "perfect" car, and doubt that I ever will. If it were perfect that would mean that I could see any place for improvements. I've never seen that on my cars, or anyone else's for that matter. Hot Rod mags are good for reading and do generate some good ideas, but nothing can replace a few years of hands application of Hot Rodology!!!! As with anything, we learn from mistakes and bad ideas.