Look at EDB- A and EDB-E on the below chart.
The ID No on the DIST will also help.

SOURCE - JOHN MUMMERT
EDIT - ADDITION
Look at C0AE Cyl Head description and notice valve size -

SOURCE - Casting ID Nos. Cyl Head - FYB 1958-1964 Head Casting Nos - Tim McMaster
FYB 312 Crankshaft - 1956-1960 B6A 6303-C


Also, to help ID components correctly, in addition to the CASTING ID No, the CASTING DATE CODE, foundry and ASSEMBLY DATE STAMP will help greatly.
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