There's not much difference between a Mac 32 and a Homelite 30 if all they have on them is 11mm carbs and open exhaust.

But the Homelites respond better to timing and combustion chamber changes

I have two Homelite 30's and two Mac 32's

One Homelite 30 is stock including magneto except for a 11mm carb and open exhaust and it runs the same as the one Mac 32 that is also stock except for CH ignition, carb, and exhaust.

The other Mac also has the cylinder and edge of the piston cut down by TKG. It is faster than the stock Homelite by a little over 150 rpm.

The second Homelite 30 has everything done to it that is practical for a airplane engine. It is 500 rpm faster than the stock Homelite 30 both with a 18-8 prop.

A Mac with CH ignition is a nice looking engine. Unknowing people will think it was manufactured to be a model engine.