only the top 4 bolts are the actual holt tranny to motor, bolts
those supports that come down from the side of the block and kinda wrap around the oilpan to connect to the bottom of the bellhousing, those "might" be un threaded , maybe, but they should be a 10mm bolt that come thru from the front
the 4 upper bolts should be 12mm and come in from the tranny side