Need some opinions to make a good street suspension

Hello everyone, i am fairly new to the site, but not to mopars. My family and I race mopars(72 dart in fact!). I just purchased a 1972 dart swinger that i will be slowly restoring. It currently has a /6 in it that i might purchase some basics from clifford for so the motor is a little fun while I work on the body and also building a 340.

My question is what can i do suspension wise that I can do now with the /6 in it and not have a problem when I swap the 340 in? I have been looking at addco and hellwig, but am only seeing front sway bars. Also, I am looking for off the shelf parts, I dont want to build a custom suspension. Like mentioned in the title, this is for the street. I want something the corners and handles well. thank you for any help that you can give me.

Chris

Without going to a high dollar tubular k-member. I would suggest the .0870 340 torsion bars, A sway bar maybe tubular upper A-arms and a general rebuild of the front end like ball joints upper and lower bushings,tie rod ends. Also unless your going to buy specail conversion motor mounts ,you will have to replace the K-member with a V-8 one when you go to the 340. If you have drum brakes I would up grade to disc. Just my 2 cents