Is this a good price for a revo roller for brushless conversion?

[Misfit7734]

Well first i want to thank evryone in advance for and advice given. Ive been back into r/c for about 3 monthes now after a long time of and have a a tt01 dark impact and now a e-maxx 3905. I LOVE my 3905 and was thinking fo going brushless but ever since i got the 7 cell i think it flips over enuph ass is. Well i was talking to one of my friends today and he bought a Revo 3.3 and has played with it about 2-3 times and has not touched it since. i can buy it off of him for $150 with no motor or gas tank or 250-300 with. So my mane questions are . Is this a good deal for a mostly stock 3.3 roller? and 2. howmuch will my conversion to electric cost. since i was planning on eventually brushlessing the emaxx i figure if i can get a system i can swap between the 2 its even better. and yes its a relaiable source i KNOW for a fact the car has just been sitting for monthes
also wanted to mention i;m on a budget so while i dont want bad parts i also dont wana spend 300 on a motor and 250 i dont need 50 mph 38-40 would be fine since i just want some more speed than my new max but nothing crazy
thanks again hope i did not ramble to much in my first post