Regarding coil tags, and by way of comparison to the previous one, here is the tag for an early XY GT.

This shows that it is a:- ‘351C’, engine; ‘70’, model year; ‘1’, first version; ‘A18’, 18th of January engine build; and ‘CK609A1’ engine code. This is a ‘D’ block code.

As a check, here is the block from that engine showing the casting numbers:- ‘DOAE-J’, is the ‘D’ block casting and - not too well reproduced - under it is the casting date, ‘9M13’, 13th of December, 1969.
t was mentioned above that in the US they changed to engine code stickers in February, 1973. This is what they looked like, and note they were on the drivers side - in Australian terms - front face of the rocker coverand not the pax side.

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