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My best recollection is they started in 1975 in the U.S. Not all cars got them right away though. I remember some foreign cars didn't need them that soon. Cars that required unleaded fuel (because of the catalytic converters) should have a smaller filler tube opening where you put in the gas...

You said you're trying to save on rebuild costs. With the price of 340's, if you've got one to rebuild, that might be almost as cheap buying one that runs!

Just to be clear, the headers in that link are the uncoated version. They also sell the coated ones if that's what you want.

Works the other way too. I bought something from a member here who lives in Canada. $300 for the item, $40 something (IIRC) to ship, & then UPS shows up at my door asking for (demanding) about $28 in brokerage fees before I could have my package. A ripoff.