Most kit pistons are 0.055" over for a 4.375" bore.
If you need a full 0.060" 4.380" bore piston, there is still a good selection of piston rings in that size too, but I'm not sure about off the shelf stroker pistons?
I looked on Summit and ICON (KB) makes twos 4.382" bore stroker piston for the 3.91" stroke crank? IC825-40 flat top, and IC839-40 dish, 1.480" compression height? These are also 0.990" pin.
Stock rod would have that pretty far down the bore at TDC, almost need a 6.5" (6.535"? lists on summits site?) rod to near zero deck height?

ROSS had a large selection of these type of stroker pistons too, but I haven't checked in many years?