The only way to pin down the original engine number would be to find previous registration documentation prior to the engine change.
If you have old registration papers or even rego labels this will help.
You used to be able to get this information from registration authorities but with the change to digital records most of these are not available and if they are only go back 20 years or so - so you may still be in luck if the engine was changed sooner rather than later. Also some authorities have restrictions on information release due to privacy considerations.
10 years ago I was able to get original information on both my Series 1s from NSW for a fee, however at the time they were transitioning from paper to digital and the new system would only have records from 1982 - so I just got in to get my records from 1957 but I would not get them now.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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