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Yes, you can run Euro specs assuming you don't increase the overall ignition timing (distributor advance + initial static timing). The difference between 5º ATDC and 5º BTDC is 10º. Typically, the 5º of retard (ATDC) is provided by a vacuum retard unit which only works at idle. Some folks disconnect this and use 5º BTDC for the initial setting. An adjustable advance timing light can verify the total advance.
I think you might have the specs crossed. US specs are usually ATDC for emission purposes.
Hope this helps,
Sherwood Lee
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