Pete your right on-- I start a new note book on every car I build so all this is recorded during construction. If I don't know what it fits ,It's a trip to the Parts Supply and Believe me I probably have not created a lot of Friends in the Auto parts business because of this.hehehehe I don't have any idea how many water punp configuration the were for 194-292 or all the interchange --- maybe some one else does. I do know the shortest water pumps I ever found were for 64 -65 Nova's and some of the longest I ever saw were trucks.As for the fan bolt pattern I have seen this different from box to box for the same part number.Some pumps have both.It just depends on what the pump builder used.