So I'm now at the stage of re-building fresh engine. I've had the crankshaft re-ground and before I install, need to decide on which rear seal to use ----- rope or neoprene. Trouble is the seal surface is far from perfect with rust pitting from sitting. The engine machinist was able to polish the surface but it's still not perfect. Russ Martin recommends using the rope seal in such circumstances and I'm asking for opinions here please. I realize the rope seal is possibly going to leak somewhat, is the neoprene going to leak more / or less ? Also in regards to the rear camshaft snap ring ---- I got a new replacement from Russ Martin but it does not have a rounded side like original. Is that going to be any drama ?