Got this 1968 Taco 99 judging by the serial number, and the 359th one made so pretty early in production for the year. What engine would this have? I know a briggs, but what HP? What model? Also what does a halfway decent era correct engine cost? (not looking for a quote per the rules of OldMiniBikes, just trying to get a rough idea) You can see the purple paint underneath. Also are the grips or at least throttle and brake assemblies original? Any other info would be super!!