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Ford Mustang fastback GT390
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As above, what are the best spark plugs & oil to use in my 351c (1970) the motor is well run in, 3 speed auto, full MSD, full length headers, bigger cam etc.
 

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Agree with the plain 'ol Autolite Coppers. 24 (colder) for high compression, 25 or 26 for everything else.

Don't know what kind of oil is available in the UK
 
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