@dlearl476 asked “I was asking how you tell the difference from the above photo.”
Well, basically, you can’t.
If you can look up under the back end of the car, you can look for the spin-on oil filter, but the BIG give-away is that the T1 exhaust exits horizontally, while a T4 exits vertically, down. (But you could never discern that from the photo).
This was kind-of an issue when I got my Massachusetts replica registration, because the engine supposedly has to be what was in a ‘57 Porsche Speedster, a 1,600cc. Unless you tear down and measure the engine internals, how you evah gonnah know what it is from the outside??