No mention of what rear suspension is in it. Might be easier to move the rear forward some and move the wheel opening forward instead of opening it up in both front and rear. That's often done when backhalving a car anyway. Depends on what tire you use. You won't know exactly what needs to be done until you make the leap and set the body down on the chassis. Between body placement and moving the rear, 3 1/2" of wheelbase difference should be able to be dealt with. However, I have an idea that may not be the biggest issue you will have to deal with.