You DON'T want Wilwoods. I have them. Pad area is smaller than std brakes. so no point.

The cup racers used std brakes. So should you. just use std calipers with ds2500/3000 pads and Brembo HC discs, decent fluid and lines.

You don't want ITB's, again I have them. Far too expensive for the gains you get.

Just keep it simple. get it serviced and maintained properly. If you want to mod it at all. Get some decent coilover suspension and gets Mark fish in harlow to set the car up. Thats the biggest thing that makes the most difference to track performance and enjoying it.

Decent race seats and harnesses make a big difference to way the car 'feels' as well. As does a decent wheel. Standard one is big and will be knackered.

I wouldn't strip it too much. keep it a nice place to be.