Tri 5 rear suspension advise?

[brandonc707]

Looking into which kit to install on my brothers 55 chevy, it's a street car with about 450 hp+~......... He would like to mini tub it while we are doing this. I have seen the ridetech and heits kits, what are the pros and cons of these kits? Or is there another kit to consider?? He would like to eventually redo the front also but not at this time. Since it seems that there is a lot of suspension knowledge here I would like to pick your brains........ Which one is easier to install? Which one works better for cornering? Which one will have a better ride quality?
Thanks in advance!