ur going over kill with ur grounding project buddy, but illo support ur addiction all u have to do is make sure the engine block has a good contact with the frame (chassis) of ur car which is functioning as the ground connection, any bolt attached to the frame will work, any bolt hole off of ur engine block will work, what u might want to do is sand down the connection point and attach a copper washer over the top of ur grounding wire connection due to that some paints are not conductive. good luck