Glenn,
In my opinion it is not a good match for your intended purpose. If I remember correctly, plans for the Akromaster show a slant plug Fox .15 with no muffler. Something of that power and weight category would be fine. Vintage engines of that era include the baffle Fox .15, Enya .15, steel fin Max .15 (I, II, or III), etc.
The last Akromaster I built had a TT .10 (w/muffler) and I built it with extended wings.
If you want to use the McCoy .19, you might consider putting it in a Skyray 35 or Flite Streak and flying it on 52' X .012 lines.
I'm not sure if there are kits available, but as someone mentioned, the profile Peacemaker would be an ideal match. It's similar to and sized between the Flite Streak and the Flite Streak Jr.
Good luck whichever way you decide.
George