It is the Lucas Distributor that would cause the difference with the ignition timing, if you used a Delco Distributor on a TE20 as used in a TO20 then you set the timing the same as the TO20.(i.e. 7 deg + or - 2 degrees BTC), you should have the engine running at 400rpm to check this with a timing light. If you set it with the engine running faster than 400rpm it will be doing it with the Distributor partially advanced, at 400rpm it is at zero advance.John(UK)
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