A cheaper way to make a scooby more tail happy is
Leave the standard front anti roll bar in,
Put a 24mm whiteline rear anti roll bar in,
Adjust your front camber to max negitive camber, it will be somewhere around 1.5 - 2 deg neg
Better still, get a set of white camber adjustment bolts, and go for 2.5 deg neg camber on the front, harder on the tyres but cheaper than a gearbox!
Done! and very cheap! Worth a try before you go spending all your money!
After that, go for a good rear diff, 1.5 way is best all rounder, 2 way for serious arse out stuff!
Regarding dohnuts, Scoobies don't like dohnuts because they suffer from oil starvation when subjected to constant lateral g forces, (the oil goes up one side of the sump and is not sucked up the oil pick up and the engine runs dry for a time!)
The fix is fit a baffled sump! but that is quite pricey, a cosworth baffle plate is a happy medium! and not to pricey!
That's it really! as far as I am aware! I hope all of the above is acurate, I'm sure some one will correct if needs be!
Have fun!
Dan