Heres a very popular and proven combo used on Spartans and M41’s
All soldering is done so its just plug and play.
TP4060 (40mm x 92mm) 1650kv
68mm cooling jacket
160a RCBB waterproof ESC compatible with Traxxas radio gear
You will need to figure out the most appropriate prop for this combo, anyone doing this kind of upgrade should be experienced enough with brushless boats to sort that out