I'm planning my order for A RF and need some help figuring out a few issues.First there is an option for rear wheel arches,but I don't see much differance in the cars on there gallery of cars,I really like the look of the dark blue with white stripes,does this car have the optional wheel arches?Second can you use only 302 engine or can you also ues 351 with the adapter that comes with kit?Third It says it comes with Flywheel & clutch,don't I need these to balance my engine ?Thus not being able to work on it while waiting to get the kit to get here.Thanks