You are squaring your front wheels off of a fixed (straight) point which happens to be your rear wheel in this case. To get the level past the body you will need to hold a couple 2x4 blocks against the right rear wheel and then hold the 4 foot level against that. From there you need to measure the lip of the RF wheel at the front of the wheel and the rear of the wheel (on the outside) and make sure the distance from the wheel to level is the same (this will give you 0" toe in/out). From there, repeat on the left side but your measurement on the front of the left front wheel is going to be 1/16" less to the level than the rear of the wheel (1/16" toed out). Take a 4 or 5lb chunk of lead, put a tip tie through the hole and hang it on one side of the steering wheel to take out the slop (use the same side each time you set toe).