190 XS GTO's were produced in 1966, out of 96,000 + GTO's total.
Being that rare, I suspect that you are the gentleman on the GTO forum who's looking for the guy who last posted in 2005 about his '66 XS engine with no car.
If so or if not, you should check out the GTO forum and PM the moderators and try to track down the long gone guy who has the XS engine.
If not, you'll just have to be happy with the rare car you have as it is. It is cool no matter what.
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Jeff 
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