I have a 1951 gmc 3/4 ton pickup. 228 cu 6. the distributor is loose in the block hole. this movement creates a problem with the point adjustment. do I need a new distributor? is there a bushing that needs to be replaced in the block or on the shaft? the adjusting clamp seems to move with the distributor is there some sort of a problem with the clamp being attached to the vacuum advance ? Also the distributor moves (with the clamp) up and down. Is it improperly seated? Lots of questions any ideas? thanks