Guitarman52
The Eflite 60 is recommended for planes in the 6 to 12 lbs range. The Sbach342 50E 3D is in the 4.6 to 5.3 ibs range so it is not that surprising that the motor does not easily fit.
For 'new to electric' you do seem to have jumped right in!
Personally I would have recommended something a bit more modest to get some experience with electric power set ups.