Help! In an attempt to remove the t-stat on my 84, one bolt broke off. While attempting to drill it out while still on the car, the bit broke. Now I am at the point where I think i need to pull off the water pump in order to get the bolt out of the housing. The housing itself appears to "float" on a fitting from the block and on the throat of the pump. Can this be removed without pulling the pump? If the pump needs to be pulled is there anything special that I need t be aware of? Thanks in advance.