extra oil in rebuilt 6 cylinder

I just had a rebuilt 6 cylinder put in my 1966 Mustang. The shop put 5 qts of oil in rather than the specified 4.5 qts. I didn't notice until I had driven it 500 miles. I took it back for some final things that weren't done the first time. I mentioned that they put too much oil in. After they changed the oil again, it is again .5 qts too much. Will this damage the engine? I plan on draining the extra .5 qt if it is a problem.

Thanks

Allen