That's one way to put it ;)

"Or the tradition of the Caffi family, with a victory that had something of the family business about it, gained by Angelo in 1965 at the wheel of the Alfa Romeo Giulia...."

AGAIN, this is FAR FROM IDEAL but it would be my first stab at it if I were doing the translation. I would come back to it and improve it. Over to you, Penny !

with Angelo's truly exceptional victory in 1965
or
with Angelo's unprecedented win in 1965
or something like that

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Note added at 13 hrs (2019-05-15 08:55:24 GMT)
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Hi Penny
In consideration of the rest of the text you’ve posted
O la tradizione della famiglia Caffi, con la vittoria che profuma d’impresa ottenuta da Angelo nel 1965 al volante dell’Alfa Romeo Giulia,e le due affermazioni di Alex nel 2005 e 2011 per non parlare della prestazione mostruosa del 2018 con la Porsche 911 GT Cup. –
If the first win is by Angelo in 1965, this win isn’t in family tradition as it’s the first one that sets the trend, followed by Alex in 2005 and 2011, with another “family” win in 2018.
Try something along these lines
Angelo's truly exceptional victory in 1965 at the wheel of his Alfa Romeo Giulia made the Caffi name something to be reckoned with, with Alex following in his footsteps in 2005 and 2011…


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Note added at 13 hrs (2019-05-15 08:58:07 GMT)
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“Impresa” in this context clearly means an exceptional feat, and has nothing to do with a family business/enterprise.

impresa (1)
2 (azione gloriosa) feat; exploit; deed: impresa eroica, heroic feat; le imprese di Rolando, the exploits of Roland