There is also a 2 pc. neoprene seal upgrade for these engines as well to eliminate the rope seal seal.
Several things that make the 1 piece seal a little more involved is that not all articles show the entire process. Since these engines do not have main caps that index into place, they basically just float around and center on the crank journal, its difficult to affix them to the block with the crank out of the block. So a centering ring needs to be made to locate the cap on the block to act as the crankshaft to center it correctly, or the pocket you machine for the seal will be off center from the flange on the crank and be a potential leaker. Also, if the block has main shims, they need to be installed during the machining process as well or the hole for the seal will be out or round when you assemble the engine with them in place. A lot of little secrets that a seasoned machinist will know that a hobbyist or DIY person may not realize. And these little things can add up to a not so successful engine mod.
