Unless Santa bought/delivered them, there is no WISECO in that block. Cossey can confirm too. He was there when Pampena did work on the car before it went on the dyno.
Nick (single turbo 94 3S) had upgraded pistons but I am not sure the brand?
I am a fan of the stock block but upgrading the pistons wouldn’t be a horrible idea. However, a stock block that can go 9s is enough for me to keep it stock.