One of the most important things to determine is the Date Code. It's on the back of the Block and can be hard to see if it is still in the car. It is also on the Heads (under the Valve Cover), Intake and even the Exhaust and Water Pump.
Dave is right that DK is for a '66 283-195 as mentioned above,
but it is also for a '62 283-170 HP, PG Trans and with A/C.
Sounds to be correct especially since you believe it is a '62 and you have already proven the Casting Number to be for a '58 to '63.
Your Engine Suffix Code of "To325DK" tells us that the engine was assembled on March 25th, but that will only tell us the Month and Day. The Date Code will tell you the Year as well and the complete Date should be a little before March 25th.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America