Unleaded or even E10 should be fine if you have excluded latex containing items first. Particularly pump diaphragms.
The three places latex (natural rubber)occurs: is the diaphragm in the SU fuel pump; the accelerator pump on the Solex carby; and the fuel hose in between. So the rule is no NOS items from 10 or more years ago, when buying replacements check they are latex free or ethanol safe.


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