Pardon my intrusion, I seem to be in a similar predicament. I just got a Brat after 20 years of waiting only to find a seized engine and dried coolant crud throughout the system. The 2 long bolts on one side of the intake manifold of snapped the heads off upon attempted removal. So I soaked it in penetrant oil, the drilling got FUBAR and askew, torched it, whacked at it to loosen it, and tried to gently pry it. After crying a bit, I took a slide hammer with an old coil spring compressor end to grab into the water neck opening and gave it all I got to pull it up and out...to no avail. Maybe half a millimeter of movement. Then more tears. Then by brain thought it could be a good idea to cut into the intake bolts. My theory was to cut the binding and rusted tube in half, thus making it twice as easy to release the kraken. I'm still crying and debating cutting deeper or yanking harder, or buying a new motor. Thank you for shopping at Subaru. Good luck everybody.