After a lot of reading and some helpful input from Roxie at Central Hobbies here is my setup:

OS 160 FX
Tettra 18 oz bubbeless tank
APC 18x8
Hatori #850 muffler
Hard mount engine

BTW...if I remember correctly someone at QQ wrote that a 35cc plus engine is not recommended and they will not stand behind the product if you try it. Perfectly reasonable on their part and I wouldn't recommend it.