so far one of the strongest auto i've seen in actual tested numbers and in person trial is Easy Ryder from joint doctor its a ak47 cross so depending on when you take it down you'll get more head or body, but actual testing puts it at around 19% thc. just don't get the knock off "easy rider" from cres seeds i think it was.
but if you really want head high go with a sativa auto like dinafem haze 2.0 or big buddah super sativa auto