Iranian Crisis Replacement?

If the Iranian Crisis was butterflied away, what similar foreign debacle could possibly hurt the United States in the late 1970s?
 
An Islamic Republic declared in Saudi Arabia, with the pro-American King being replaced by a fundamentalist regime.

Saudi Arabia is already fundamentalist (as well as pro-American). They make Iran look like a liberal democracy. A better fit would be a Nasserist military coup in the late 1960s that turns Saudi Arabia into a Soviet ally.
 
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