Its not a black art like some make out.
The oil feed direct to the head for the vvti is in the block. Any other S block would require stuffing around which would gain you nothing. The beams block would be stronger imho than any other 3s block.
3s cranks dont crack unless abused.
The beams rods arent suited for boost.
If you want to go this route i have a beams block head etc sitting around still.