The block casting is 3970010 K2 and the engine id number by cyliunder #2 is T91589500 KO410T4W. I can not find the engine suffix anywhere on the web, can anybody assist me on this.
3970010 comes up 302,337,350 for years between 1969-1979, T91589500 not even close to vin numbers, probably replaced original, KO410 is Ontario, April 10th, but what is the T4W.......?

Thanks in advance!!

 

So not original to a '64, but an appropriate swap, and its never had the block decked as that would obliterate these numbers. The numbers to the left contain a partial VIN, but we already know its not numbers matching.