The 1968 Howmex TX had a turbine engine used in helicopters made by a firm called Continental I believe only one of the three cars mentioned has it (unless the new build has managed to get hold of one). When one of the cars was at the Goodwood Festival of Speed it was running a Ailson (?) engine and had to be jacked up and held on the brake to start up. It did not have the proper waste gate system.
Regards Allan
Regards Allan