Help finding '77 250 thermostat housing!

[71Burb]

Hey guys, can't seem to find this part anywhere?? I was changing the thermostat on this truck i just purchased. It is a 250 6 cylinder. The bolts holding the water outlet (on top of thermostat) where completely corroded and broke when i tried to get them off. So i took off the housing below it (which has a nipple for the heater and the temp sensor and mounts to the head) and tried to repair the holes by drilling them out. Unfortuneately i cracked the ear where the bolt hole lives. It is made of soft metal (aluminum?)
I can't find anybody that carries this part? Anybody know where i can find one? Part # is 352161.

Thanks, Al