As to props...A G62 will turn a DynaThrust 22-10 at 7500 at my altitude, 7000 feet..
Same engine turns a MSC 22-10 prop about 6500...
Which number would you advertise ?

Most any old G62 does this, some better, some worse..Been running G62s for 18 years, usual prop is a Zinger 22-10, about 68-7000...No muffler...