If you have the brushed version of the blackout, then you will have to use both the motor and the ESC from the volcano. You cant mix the brushed blackout ESC with the brushless motor.
The volcano motor should bolt right in, but remember to swap the pinion gear...and watch the temps of the motor the first time you use it. Usually you can get away with using the stock pinion gear of a brushed motor when you put it on a brushless motor...but sometimes that pinion will be too large or too small (tooth count) which will cause the brushless motor to run hot which could cause damage.
I use a $20 duratrax temp gun. Temps between 120-140 are good, 150-160 is OK. Anything above that and you will shorten the life of the motor. If temps get above 190, it is only a matter of time before something in the motor fails.