The 324 was built from 1954 to 1956:
Engine block Casting Number 568922
The 371 was built from 1957 to 1960:
Engine Casting Number 573562
One sure way to tell, if you have the engine down, is to measure the Main Bearing DIA.
324: 2.498 - 2.499 (#1-4) 2.623 - 2.625 (#5)
371: 2.748 - 2.750 (57 & 58) 2.999 - 3.00 (59 & 60)
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1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi.
1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels
1989 IROC-Z - 5.7TPI
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