What power is the car running? Its an RWD converted Escort Cossie yea??
To be honest, with 888s... softening the tyres up slightly and making sure that you do as much as possible to stop the rear squatting really hard on the launch should do the trick unless you're running serious power.
Throw a picture of the car up so we can see exactly how low we're talking here??
But then you can't expect old skool suspension design to cope with 400+ when it was designed with 220ish in mind, back in the 80s/90s.
Cheers,
Grant