This is not rocket science to be sure. Lots of proven combos to do what you are trying to do. You need to make a decision on exactly what you want to do with the car. Is this a temporary deal just to have something to race for now. Id its the latter then the KISS principle seems to be a good way to go. You are not making a lot of HP and just about any rear suspension can EASILY handle it. If this is a temporary race car, which is kind of what I'm getting here they why go extravagant. Just fix what needs to be addressed to make the car safe and legal to run. Caltracs are MORE than up to the task of making the car work easily. Why reinvent the wheel or invest a lot of money in something that is going to scratch a temporary itch while you chase/build the NSS car. Seems to me the money is better saved for what your real end goal is. Just make what you have safe and legal go racing and learn.