That is a good question jeff, I tend to say that you would be lucky to just find an engine number that is correct to your month of production. It is hard to know what your orig. number would be unless someone wrote the number down. and you can only know the correct motor if you decode your vin number
Poets Seat AutoAppraisals, Parts, ServicePast: General Motor's Master Technician
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Collector of: 1951 Army Chevy Burb barn door,53 GMC COE,two 1934 Chevy Truck,1935 Chevy Army Truck.1950 Gmc Suburban clamshell these are just my chevy/gmc trucks.