Hey,

I may be splitting hairs but I have a hanger 9 P-51d ARF and 2 new-to-me Fox engines I can hang on it:

1.) Fox .74 Eagle IV

2.) Fox .78 without a muffler


The .78
-Seems to be older due to the earlier Carb
-Has a valve door connected to the throttle
-non-standard holes for the muffler to attach (on the top and bottom instead of the left and right).
-What muffler would be better? A strap-on or Factory

The Eagle has
- A different type carb with 2 needles, one on each side


Basically my question is: Is one of these known to be better than the other? I have NO experience with Fox engines and would appreciate any tips you have to offer.

Thanks in advance for you time and advice.