Aftermarket Blocks

i can get one for 2g here and has been fully machined but needs a fix from machining the lifter bores ended up with a small hole that needs a repair 59 degree tall deck

Is that a 340 resto block?
Is it local, have you seen it, can it be successfully repaired?
Is it Siamese bore?
Can this block be taken to larger cubes, say 428 thereabouts with 4" stroke?