i would use 10w30 for break in, start it and let it run at a high idle 1500 - 1900 rpms for about 15-20 minutes
then take it for a short spin 2-3 miles , i wouldnt go over 3000 rpm at this point but with it around 2000rpm in 2nd or 3rd floor it until you get up to 3000 this will help seat the rings properly
then go back home, and after it cools enough to handle the nuts remove the valve cover and check the valve clearances, if in spec or maybe a tad loose, say .010 and .012 your ok, change the oil and drive basically the same way for the next 500 miles a few full throttle pulls but nothing for very long and not over 3500 rpm
