What Products are Needed in the A-body world?

Thanks for the input guys. I will have to look into it...as of now, I am having trouble with DMV and registering this Valiant...why does it always have to be so difficult?!!? LOL. What geometry is bad about the Mustang? I am not questioning at all...just trying to learn. What about using a Dakota spindle? That would allow you to use "Mopar" stuff, and finding the disk brake setups shouldnt be too hard. However, I do like the idea of some how reinforcing the inner fender, or making some sort of tubular mount and not having to build an upper control arm. Would just aid in keeping the costs down.
I need more input on the transmission crossmember...would this be appealing to people? I wouldnt question it so much, except the idea of having to drill out all of your current spot welds, removing the factory piece, and then have to weld some sort of mounting tabs on the factory subframe. Let me know.