triangulated 4 link Suspension Travel ??

I have a suspension question for some of my fellow tried and true Members, I'm getting ready to build my triangulated 4 link and did a mock up of how I'd like the duster to sit and once I started measured clearances I found that I have 3 1/2" between the frame and axle housing. This car will basically see street use and a occasional trip down the track...So my question is will this be enough clearance without bottoming out ??? the included pic is how the car would look with a 29" tire and the inner circle is to simulate a 15" wheel and the outer clrcle is to simulate a 18" wheel. Thanks for the help on this