Sixty4sedan - I live right by Steves shop(HRTH) and have seen a few of the cars that have come out of there. If your going to be mostly streeting the car I would say that this is an excellent choice for good all-around handling. It will do well at the track but not as good as cars that are specifically set up for this. I guess the most important question would be what are you planning to do with the car? If your going to mostly cruise it then a truck arm will be fine. The only bad thing about them is the unsprung weight and the fact that it is hard to route exhaust out the back if that is what you want to do but if your going to be mostly cruising and putting your foot into it occasionally then it is a great way to go. It is also highly adjustable as far as stiffness and ride height. If your going to be doing any serious tracking of the car then you would be better served to go with a 3 link like the one from Lateral Dynamics. I have not driven in one but have only heard good things about there system. If your going to drag the car then a 4 link is a good way to go although the 3 link will also work well.
As far as minitubbing if you go to the frame rails you can probably put a 10" wheel under there with a 295/18/35 being the biggest tire that would not have any major rubbing issues although it will be tight and it depends from car to car. If you measure the inside of the wheel well from the frame rail to the lip it should give you a pretty accurate idea as to how wide you can go. If you measure from the rear part of the rear quarter where the bottom of the fender folds in to the front part of the rear quarter where the bottom folds in you should be able to figure out what the biggest tire/wheel combo would be.
What are you going to do about the front end?
You may want to check this site out:
http://www.stevesnovasite.com/forums/index.php
They have tons of info for what you want to do!
Good Luck!