Hello everyone. I'm new to the forums. I just purchased a 1956 Cadillac Coupe 6237 and the engine is missing the cylinder heads. I believe the car has a 365ci engine form the factory, but some people had told me that the 331, 365 & 390 use the same heads. Does anyone know where can I find some used or rebuilt heads? Also, Is the hydra-matic transmision rebuildable? Are there parts still available for them? Thank you all for you help!!! I love this forums!!!