how can i tell by just looking at the motor if its garbage or if it will work cause im gonna be picking one up today for 100$ and i wanna know if its gonna run the guy says hes not sure if it runs or not but if he tries to rip me off then i can easily go back to him it comes with headers and a red valve cover so how can i tell? will there be wear in certain places? if it is garbage then would it be worth my time to part the motor out and sell it??? just lemme know ...thnx