Sup dude....
To answer your question before I get off for the night to bone my wife.
No their's no big bore engine that's a total drop in for the engine mount setup of the stock chassis. You need to get a proper "big bore conversion". Many can be had now-a-days with nice engine for around $285. THeir's a plehtora of good conversion on the market that don't come with an engine. They can range from $150 or so to $200+. It's all relative and you need to keep in mind that running the power of a big bore in a Maxx can and will usually requrie spending allot of Moolah to upgrade other vital components.
The best options that are literally "drop in" are. THe Sirio .18, Fantom and Epic just came out with a new drop in engine. It sounds like you have ALLOt of reading to do. I would suggest you check out the search feature here before you spend any money.
Peace