Is this a hipo motor?

It would seem that the "K" in the VIN on the block is leading you to believe that this is a Hipo block. The "K" in this VIN indicates that the car was built in Kansas City. It is not for the engine type. My first thought was that the engine was originally in a 71 year car but the 2001 casting number would indicate a 2001 instead. The vibration damper is not thick enough for a Hipo. The four groove crank pulley sounds like a 64 1/2 one for A/C and P/S if it has three retaining bolts in which case it will be a cast one. You need to look at the underside of the heads where the push rods come through for the casting numbers to determine their original application. Hipo heads will have always cast in valve spring pockets and screw in studs. Screw in studs can be added to standard heads but not the cast in valve spring pockets.

-Fred-