I'm pretty new too but replacing the Polybushes (I have one car standard and one with orange bushes), especially on the front, seems to be the way to go. As for brakes, if you have some funds set aside, the Trackerjack conversion is very well known and highly regarded.
Have a search of the forum, both subjects are covered extensively and we have Trackerjack himself here who might be able to give you some specific advice.
We also have experienced track day racers and people who seem to have a seemly spooky amount of knowledge over every aspect of these great cars so you're on to a winner here.
Good luck with your project, remember to post pics - that's almost a rule. You build it / repair it / change it = you post the pics