i have used the Airtronics RX461 with savox 1251 low profile digital servos with the 747 for about 7 months now with no problems.
my life pack weighs 73 grams, my lipo weighs 70 and the novarossi 2660 with med header is about 70 grams. with body, enneti carbon rims 59/57 it is under 1670 grams and that is about the min. weight i want to run to not be under weight with really small tires