...and my book tells that it's a '59 to '63 engine block! (Auto Interchange Systems) I have however doubts that this is correct: the '59 regular engine was the last year with external oil filter. From 1960 onwards, the oil filter was on the main circuit; the engine block has to be different. However, the master parts book is telling that the crankcase with fitted pistons has the same part number from 1959 to 1962, with one detail: for 1959, some parts have to be ordered: a plate, a gasket and 3 bolts. I assume that for the spare parts business the block was from the later type and the provision for the oil filter on the main circuit had to be neutralized for 1959.
If your Brougham has the external oil filter it came from a 1959 car; if not, it can be from a more recent vehicle. Is the VIN not stamped on your engine?