That makes sense since it's a racing kit. Then yeah, would be better to get the proper mount vs raising it with spacers or something. The mount conducts heat to the chassis, so the more contact area it has with the flanges, the better. Also would flex less.
My only suggestions are
- I'd really go with a waterproof t/b servo just for peace of mind (may have mentioned that before)
- I'd go with a medium plug vs medium hot with 25% such as the FAST760-5 vs the FAST760-4
- I usually shy away from engines with composite carbs. Fully composite or...
Probably not. If you want to run a 7.4V lipo with 6V servos, you need to get a regulator. Or just get servos that can run off 7.4v.
Some run 6V servos on 7.4V, but why start out with something that could be a problem? Especially when your spending that kind of money. Savox has high voltage...
Personally, I'd steer clear of arrma servos. I'd also go with something 200oz-in+.
If you can fit a standard, the savox 1210SG is a decent servo for the money. Waterproof as well.
Speed @6.0V: .15 sec/60
Speed @7.4V: .13 sec/60
Torque @6.0V: 277.7 oz-in (20.0kg)
Torque @7.4V: 444.4 oz-in...