I think that a Saddam Invasion of Kuwait on 22 September 1980, will not ending good for Iraq future
Because the second Oil crisis that started in 1979
The price of crude oil more than doubled to $39.50 per barrel over the next 12 months,
Now does Saddam the foolery of Kuwait invasion during the Oil Crisis would skyrocket the price of crude oil
(
OTL during OTL Kuwait invasion the price jump from $18 to $41,45)
Just imagine The price of crude oil at $39.50 goes up to $80 after 1980 Invasion prolong and worsen the second Oil Crisis
The Industry nation will not tolerate this, in same time the al-Sabah family will do everything to get Kuwait back and will pay for military operation just like OTL.
And a coalition is formed between the al-Sabah family, USA and European Industry nation (Britain, France & other, maybe entire NATO ?)
In OTL was Saddam consider as Ally for Wester nation against Iran under Ayatollahs, what let to Proxy War called First Gulf war - September 1980 to August 1988.
Here is consider as Backstabber Traitor of Communist working for USSR
A 1981 Operation Desert Storm would be quite different as the 1991 version because Hardware the Military use
Like AH-64 Apache undergoes testing and enter service only in 1984.
Let's look on outcome, there two ways this end:
Good one
The coalition wins Operation Desert Storm
Jimmy Carter could get reelected as The President who gave US it Pride back after Vietnam that depends on timing (nope Walter Mondale still get Butcher in election of 1984).
The UN deals with post War Iraq or trial Saddam in Den Hague for War Crimes
The Soviet could do litte in Crisis do internal problems like Leonid Brezhnev declining health
In Aftermath the Soviets will overwork there Military strategy after they failed with Iraq troops against the coalition forces.
Bad one
The Operation Desert Storm ended bloodshed and high losses for the coalition forces.
Ronald Reagan is elected with Promis "To end this second Vietnam" and goes harder course against Iraq allies USSR.
The USSR actively helps Iraq
in mean time the World economy has second great depression do to high price of crude oil at $100
(Note China is not yet a economic Powerhouse in early 1980s)
Oh by the way
There is legendary Movie franchise that is based on concept of a 1980 war about Oil goes terrible wrong.
very good analysis on that story (for the War issue jump to 5:15 min)