This stuff is from an earlier brochure but the
200 model is the 3.5hp version, is yours hardtail (no rear shocks)? I think the 363 part of the model number has to do with either year, revision of the model, or maybe even who maybe offered it. so you see that first number different depending on that.....for instance this 1970/71 pictured below is a 640-
200 and it was blue at the time.