I just noticed something related to the early vs later thermostat housing thing. The water outlet that bolts to the top of the housing, also has early and later versions. This pic is of my 1/70 car, with the water outlet from my 7/70 car sitting loose to the left. The early version has an extra tapped hole, circled in red, that I assume is to mount the bracket for the spark plug leads retainer. I noticed this when changing back to my 55 year old OE Yazaki date coded leads. I'm putting these on for car show season. Lol. I also noticed that my early car is missing the bracket that should go into the tapped hole. @zKars would you happen to have one? 🙂 Here's a pic of my 1/70 before I changed the spark plug leads. If you zoom in, you can see the tapped hole and no support bracket. And here is a pic of my 7/70 car before I took it apart for the resto. If you zoom in you can see the bracket, and no extra tapped hole in the water outlet. FYI, my 7/70 car is where the OE spark plug leads came from. Just for fun, here's a pic of my 1/70 (#957) with the 1970 date coded leads. If you zoom in, you can see the markings, sadly they are starting to fade. They do look much better being black. 🙂