The ZDZ 40 weighs in at 2 lbs 11.5 ounces with ignition.  hp is 4.25

the fg 36 weighed in at 3 lbs 12 ounces with ignition.  hp is 3.0

sounds like you have a lighter engine that is much stronger.  you will probably be fine.

i just ordered the RC Guys super decathlon.  i am excited.  i am going to put in a da 60 cc gas engine in that bird. 

the FG 36 i had in my dynaflite, has just been installed in a p51.  total weight will be 11.5 pounds.  65" wingspan.  should be fun, with keleo muffler.