Hi Mark, if you require any information on the group A era twin cam Geminis then please get in touch, I own the ex John White dohc group A Gemini ZZ. Both it and the Darryl Hendrick Gemspares Gemini ZZ were fresh builds for group A, not modified group C cars. Mine is the only survivor unfortunately as the Hendrick car is no longer with us. I am restoring my car currently to run in the heritage touring car series. Interestingly Paul above actually crewed on my car when raced by John :)