I will be rebuilding my 12a this winter and am going to start ordering parts for my stock 84 gsl. Are there any real differences between gasket sets/rebuild kits? All the prices seem to be close (around 140). Also, I will be replacing the clutch while the engine is out. For an OEM, or OEM equivalent, what do you suggest? I will be waiting to see what it looks like inside before ordering apex seals (and related parts). What else am I forgetting? thanks