1964 was the 1st year of 426ci Hemi,
could it "possibly" have a 1963 casting date {maybe?}
https://en.wikipedia.org/wiki/Chrysler_Hemi_engine
value/worth depends on what it was out of ?
Is it just a bare block ?
does it have main caps ?
if it was raced ?
& in what class ?
was it ever windowed ?
& if so, was it properly repaired ?
is it still any good ?
does it have any cracks ?
does it need to be rebuilt ?
what condition is it in ?
has it been sonic checked or magnafluxed for cracks ?
does it have all the parts ?
like rockers, heads, intake, carbs, block, crank, rods etc. ?
what bore size ?
allot of variables
more detailed information would be nice