To build a 4 mill long rod you will need the following parts.
Hot Rods Long Rod 4 mill stroker crank
Wiseco 795 Series piston (they have the wrist pins moved up 5 mm for the 5 mm longer conecting rod) It has nothing to do with the stroker part of the crank. You would still need these pistons if you were going to run a Stock Stroke Long Rod crank.
Stroker Domes, OR a 2mm spacer plate. The pisotns move down 2mm farther in to the cylinders, and Up 2mm higher out of the cylinders. So you need to some how space the head 2mm up. You lift the jugs up 2mm by placing the spacer plate between them and the cases the head moves up 2mm. Or you can run a cool head with domes that are machined an extra 2mm so the pistons wont hit them. The Stroker domes in a cool head is the best way to go. It is a lot better idea than sticking a spacer plate under the cylinders.
Port work is recomended but not required.
josh