As Kevinski stated, the earlier engine water pump locations were positioned differently than your 1955 engine. It may not fit, or might require some adjustments to recenter the opening for the fan.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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