The 283 block might be 1958 - 1960 but the intake manifold is a Q-jet manifold, Q-Jet wasn't brought on board until1965, the water neck could be from any year as they are all interchangeable. It certainly is a temperature gauge sending unit but that port was used for emissions/spark/heat riser control.
Last edited by Peggy M; 05/21/2024 1:52 AM. Reason: Remove quote
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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