Is the intake still off?
Can you see the washer?
Is it in an intake runner?


Try using a small hook made out of a coat hanger


Some glob of grease on the end of a small stick or end of screw driver


Never use stainless bolts or washers/nuts around open holes in the top of a motor(carb hold downs)


You can put a small diameter hose thru those head bolt holes and syphon the coolant level down below the spill level


clean up any anti freeze if any pets/other animals around