What you have posted doesn’t look like anything that would be a normal engine ID code. It could be a partial VIN. Does that number sequence match your VIN?
That is an odd one indeed. My guess would be GM sourced replacement short or long-block and that is the assembly number preceded by the year of assembly. Complete speculation though.
The number "6496295" is a valid Chevy parts number sequence, and "649" is a good prefix, but not for motors. I checked a mid-60s master catalog and nothing in regards to an engine block starts with "649". Everything starts with a "3", which is pretty normal for this period.
Does the motor have a recessed oil filter? What is the casting number?
--EDIT--
The part number sequence 649629X are mid-70s lamp or instrument cluster related lens pieces. I cannot find the exact number 6496295 in my references, but numerous valid numbers in the sequence 6496290 - 6496299. GM usually didn't jump around with numbers where an engine block would be in a sequence of lens related parts (never say never though )
That was my next idea is to check the cassting numbers. By the looks of the engine bay and oil film build up..gm points distributor, it has been in this car for a number of years. It is a Canadian car.
An original 1966 283 would have a194 cast in the side of the block also last 3 numbers of casting number at rear of block drivers side unless its a replacement block
The number on the front of the block almost look like a camshaft number
The other option is the block has been rebuilt and the block milled and the numbers could be a year “77” meaning 1977 and the 6496295 is an invoice number or some way of referencing the block to the work that was done
The resurfacing of the block and the restamping is a possibility. Going to dig through some Grease and Peek down behind for a casting number.
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