Which Forged Stroker Crank?

Yeah, your piston is heavy and so are your rods. A standard forged crank would probably need a few slugs of Mallory to balance it (but I'm not an expert).

What kind of power are you planning to make?

For what its worth, I used Scat I-beams (595 grams) and Diamond pistons (~500g) and my crank (forged Eagle crank) didn't need ANY heavy metal to balance it....but that is about 200g lighter that what you are going to use.