Sure looks like you're original block to me... casting dates don't mean much at all...under the drivers head on front of block you will find the engine assembly date. That matters much more. I've seen some large spreads on 340s between casting and assembly.
Looking to sell as is...not interested in taking it apart at this time...
Pretty complete car...body and floors are rotted.
Has a PA title
$2,000 or best
Located in North Collins NY 14111
Car is not worth fixing.../6 225 904 7 1/4 non sure grip.
If it's still here in November...than I will...
67 68 and 69 are all different
67 has a round knob radio and no holes drilled for a Vin tag.
68 has a bunch of holes drilled for the lower pads, and holes for dash vin.
69 has Vin holes and a thumb wheel radio, making it completely different.
Yes extra holes can be welded...but the metal is...