Help! My 84 was overheating and when I attempted to pull the t-stat one bolt broke off in the housing. To make things worse when I attempted to drill out the bolt, the bit broke. Now I am at the point of pulling off the waterpump to remove the bolt from the housing. The housing itself appears to "float" on the throat of the pump and a port on the block. Is there anything special that I need to know or be concerned with while doing this? Thanks!