Like John said, you need to find you a good builder, and go with that, most shops do one stop shopping, and they will be able to sell you everything. Generally you need to have porting done once you do a stroker, either that or s spacer plat, goes between the cylinder and bottom end, so that the port timings will be right with the longer stroke. Also, you will need specially cut domes, but you can use a regular cool head though, the size is up to you, and what kind of compression you wanna make.