The Cub, sadly does NOT have the power of even a Golden Bee, let alone the Black Widow. Unless you do some hop-up work and run high Nitro fuel. Then it will sing a very different song. They are a very low compression engine, so they require a hot plug and high nitro to really run well. In addition they usually need complete disassembly to get rid of burrs and other obstructions in the airflow. Improved balance and a replacement needle valve assembly are a boon also.
Get a Black Widow at a garage sale or e-Bay. Much easier.
The Miss Ashlee was designed for Black Widow power, I wouldn't expect it to have acceptable vertical performance with a Cub, except on very short (25' or less) lines. With the BW, you should be able to go to 35' or possibly 45' lines.
The Pinto, and its restyling version Hunter Stunter fly superbly on .061 engines and 50' .008 lines.
I too am sold on the AP Wasp, and use a paper clip to hold the throttle open. APC 6x2 props are an excellent match to this engine. For more speed, try the 5.7x3 (new version)