Not to advanced...
1) Head has to be off in order to be welded, no way in hell mike would weld it with it on the car.
I would recommend tapping it larger and pipe plugging it, then use the oil filter housing for oil supply. The heads are a soft aluminum, any decent tap should cut through there easily, just go very very slow and watch where the shavings go. Then put in a larger pipe plug size.
Just my $.02