control arms
 

where is the best place to find some lower and upper arms? they will go on my convert. so im not looking for the hardest cornering arms but some that provide a good ride and better than stock cornering.

Replacing upper AND lower control arms with stiffer bushings, you create MORE bind in the 4-link suspension. This is a bad thing, and will not offer better handling, but in fact will do the opposite.
Great, if you wish to go drag racing, and hold the pinion angle correct..., but for street/roadcourse its not the way to go.

If you just want to improve the handling some and don't want to get too extreme or expensive with suspension mods I would recommend just getting some springs and dampers. Chassis bracing always helps too. You may need caster/camber plates depending on how much the springs lower the car.

I would just do the lowers and leave the stock uppers in. I put the Maximum Motorsports arms in mine and they seem to have neutralized the cornering a lot more (less push). Between them and the panhard bar, things are a lot less scary coming off the corners.