The Novak 550 is really not the motor you want to be using, especially the 4.5t 5000kv model. It might be ok if you gear it for around 25mph or less but pay close attention to it to make sure it doesn't get too hot. If you run it in grass pay extra close attention as it'll heat up even faster.

Assuming your Revo 3.3 has the stock wide ratio trans gears, with 10t pinion, 40t spur and Talon 5.9" tall tires you'll be at 27mph. I doubt the pinions come any smaller than that and you don't want them any smaller otherwise they'll wear the spur out faster. The 40t is the largest spur as well. The only way to slow it down any further is changing the internal trans gears from the stock "wide ratio" to the "standard ratio" which would bring you down to a safer 25mph with 10/40 gearing and Talon tires.

If your Revo has the 6.3" tall tires with "wide ratio" trans gears you're at almost 30mph while the "standard ratio" trans gears bring it down to 27mph with the same 10/40 gearing. But I'd install the "narrow ratio" trans gears as they'll bring it back down to around 25mph which would be a safer bet. The trans gears are fairly easy to replace and cost about the same as a pinion (under $20). If it was me I'd use the "narrow ratio" gears (no matter what tire) and the lightest, smallest diameter tires I had. Both will slow it down and help keep temps as low as possible.