Rather than get into just how much clearance it should or shouldnt have, and you will get a dozen different answers, there is another way.
Firstly .0006" is a bees whisker over 1/2 a thou, in lay mans language, bugger all.
Clean it all and put a very thin coat of oil, crc will do, on the journal and assemble the rods on the crank. Hold the rods out at right angles to the crank (do one at a time) and let go of the rod, if it falls to the bottom it will be fine. If not its too tight. I have been using this method any time I thought the clearance may not be enough all my life and on many motors and I have never seized a bottom end.
Now this may not seem very scientific but was shown to me by a gentleman with a lifetime of experience in building motors and who's opinion I regarded very highly and as I have said has not failed yet.
Your lucky he left it slightly oversize and not undersize.