I have seen Nickey sales slips showing ZLX motor assemblys on this site. Joel talks about his ZLX motored cars many times in the magazine articles. The ZLX in this car was sold locally. I'm sure they exist in maybe more than 1 form.What I want to know are the part numbers for the short block, and the rest of the motor. This one does show a CE ft pad stamp. I don't think these crate motors existed before 71. Joel talks about them before that. He once told me he got the heads out the back door of GM.