There was a LOT of cross talk about original engines not being reinstalled in the Z Store cars and that a lot of the cars didn't, therefore, have engine #s that matched the numbers on the engine compartment ID plates. When talking about those cars it's important to remember that there were, in reality, 3 iterations. The first batch reused a lot of interior soft trim as Distinctive Industries were not on board the program yet, neither were the Banzai Motorworks reproduction ID plates. Both companies were onboard for the second batch which allowed any convenient engine # to appear on the engine compartment ID plate as they left Banzai without #s. The third batch benefited from all of the DI soft trim and Banzai repro goodies. While I'll plead guilty to going through this # issue leaving out some detail I can say with convection that they bought 55 sets of everything putting, I feel, to rest the often quoted 200 unit target for the program.
I also recall a conversation I had with one of the principals involved who told me that due to VERY POOR quality control many of the first batch of rebuilt engines had to revisit the re-builder causing delays, and some confusion, to that portion of the program.
Finally I have to take my hat off to Pierre. He and his staff worked very hard to make the program work while under significant pressure and a tight budget.