The letter in question can be found in the Wikipedia page about Ali Sulayman al-Assad.
It wasn't pro-Jewish as much as it was anti-Sunni domination. Alawites viewed themselves as a minority that would be subjugated by Arab Sunnis. Druze and Circassians and Kurds held similar sentiment.
The entire Alawi psyche was rewritten by Hafez. He changed the way they pray, the way they ethnically identify, the way religiously identify. Before the Ba'ath, Alawis didn't identify as Shi'a, associated with Arabism and didn't practice certain Islamic practices that Hafez injected into Alawism to solidify his rule.
Since 2011 they've been slowly reverting to their pre-Ba'ath identities from what I've seen