I am new two this site, and this is the first time I am posting. My question here is if anyone can explain how the length of the arms effect the handling of the car(front and rear), and if the arms do actually go bad or lose there accuracy over time.
thank you

Simply put, the longer the arm, the softer the effective spring rate. Similarly, the more offset, more leverage on the axle, softer rate. Most torsion bar manufacturers can give you a conversion chart that calculates the rate change for a given bar diameter/arm length ratio.
As far as I know the arms don't go bad, but torsion bars will; if you live in the Indy area Competition Suspensions (CSI) in Brownsburg can dyno your bars and tell you how tired they are.

360

If you don't like worms go with the arms , bars recommended and blocking that is supplied by your chassis builder. All kind of things happen when you start farting around, bar angle, wheel base, reaction of the suspension and spring rate. Start out simple and then try to confuse yourself when you think you know it all.

Honest Dad himself