I don't know what your doing with your car that you've deemed it needs camber in the rear but I will throw this out. 90% of my running these days is with the track days I instruct at Porsche Club and a VW Audi group. From this I can tell you my car has no problem keeping up with all those German sports cars and I'm routinly glued to the back bumpers of Lotus Elises mid-corner. The suspension set up is pretty much straight out of the prep manual printed here in the tech section. The only time the back end is unruly is when yours truly milks a set of tires one weekend to much.

As mentioned here it can be done properly for the right amount of money but for $3500 you could probably install an IRS rear end which would allow you to adjust the camber and put some toe in the rear..........I'd go for IRS if your serious , beam axles are pretty much an abomination. There main advantage is they are cheap and tough.

Tom