This is a 1977
"959" casting 454 block, machined to 4.350" with new brass plugs and cam bearings.
It's been sitting so has some dust, but thanks to being in Arizona, no rust.
Easy to make 448, 475 or 505 cubic inches, depending on what stroke crank is used.
The block does have O-ring wire which could be run or replaced with copper wire and machined flush if desired.
$700 in Parker, AZ