Help on 408 build

So I came across guy that posted a for sale ad in my city selling brand new pistons in box for 500$ cnd

Wiseco Pro Tru dished stroker pistons

4.030 bore -20cc dish PT036H3

9.8:1 cr with 65cc

9.5:1 cr with 68cc

Grab 'em, a +10cc gasket ain't gonna do it. J.Rob