Doug,
What little I know about the ERA 289 FIA comes from their web site, so take this for what its worth. The web site says:
Front coil-over shocks are mounted to the X just like the original Cobra. We recommend our custom made Spax units with external adjustments for both damping and height, but you can use any brand that meets the proper specifications.
So, it sounds like you may or may not have adjustable shocks depending on what was ordered with the car. If you do have adjustable shocks, it should be possible to dampen the rebound action to slow the rise of the nose under acceleration.