la ECM e' giusta per l'annata anche se non e' una 727 o una 730,ci sono dei modelli alternativi ugualmente compatibili,come spiega questo contributo dal link che ho postato:

"1990-1991 - 1227727 ECM - Corvettes

This ECM is internally the same as the 1227730 mentioned above. The difference is that this one is weatherproof and can be mounted in the engine compartment. This is the later style Speed Density system. It does not use a Mass Air Flow sensor. Instead, a Manifold Absolute Pressure sensor is used in its place. This allows more flexibility in running air ducts to the throttle body, or an air filter can be installed directly on the throttle body. It is for this reason, that it provides a cleaner looking installation on many street rods, and hot rods. There are two equivalent ECM numbers which can be used in its place without any problems. These are numbers 16197128, and 16198260.