I found out that I can file jointly with my husband by providing a W-7 form with supporting documents.

The IRS advisor specified my husband would have to declare his worldwide income on the 1040. Just convert the foreign currency into dollars and provide foreign tax info.

HOWEVER...when I asked the IRS guy..."My husband is Iranian. That means I should have his tax info translated into English (from Persian) and certified?"

This stumped the IRS guy. He doublechecked came back and said, "USA and Iran do not have a tax treaty." But said to provide my husband's income anyway.

HOWEVER:
If the US and Iran do not have a tax treaty I am not obligated to provide my husband's financials am I?
As it stands, my husband GROSSES $3,600 per year income. A nominal amount.

The tax treaty means that your husband's foreign income is not exempt from U.S. income tax if you elect to file jointly and include world wide income. I would suggest either looking at filing married filing seperately or if you have a qualified dependent (e.g. a child), then you may qualify to file as head of household. There are also several threads here about U.S. tax requirements. You may want to read those as well.

you can alway file w7 and file joinly return
and you don't need to report his income
all you need is your income on the tax return

That's what I thought...

There is no way the US can demand his financial information if there is no tax treaty.

Rules for reporting of the foreign income specifically exempt foreign residents of China from reporting that foreign income in IRS Pub 901. You can't apply that rule to other countries.

My filing showed nothing on his behalf

By filing the W-7 for your spouse and you file a joint return, you are electing to treat your non-resident spouse as a resident for tax purposes. This is why the form requires you report both of your 'world wide' income when you file this way.

Please read this.

I understand