Regular M1 will do the job, but M1 HM will do it better. M1 HM is slightly higher viscosity. That is a good thing with higher miles like your engine. Also M1 HM has slightly more detergents and seal conditioners, which is a good thing, unless you REALLY REALLY want to replace your engine seals instead of letting the oil deal with it. Extra detergents only improve cleanliness, as far as Im concerned - that is a good thing. Overall M1 HM is a superior product compared to regular M1. The only place where regular M1 has a slight winning edge is anything below -20°.
P.S. Many race teams use HM oils because they are just as cheap as regular synthetics, but hold up to the engine torture on the track a lot better through higher viscosity and higher dose of various additives.