If you've got them already you may as well give them a shot. I think the eflite 60s would do a wonderful job but likely overkill. 100watts per pound should be plenty I would think and the 3520-7 can do that. After seeing the eflite 46 I was just real impressed with how smooth it ran and seemingly had more power maybe due to greater efficiency / better quality. Maybe all in my head. Will look forward to some pics and specs as you get that big bird ready to fly.
I'm currently looking for a ducted fan jet. An arf preferably already painted. Not into kits yet. Need speed and don't like the ones made of flat foam.
Hobby Lobby has a couple and the videos are great.
http://www.hobby-lobby.com/f86.htm
Would prefer something larger than the 30" x 30" of above.
The really sectacular ones at 100mph plus are unfortunately $400 pre motor.

Carl