The walls arent that bad, but there are some nicks in them only towards the top of the wall near the head. I think they could be easly bored a little or just honed out. If you mean 370 as in stroking the motor, I dont know if that will be in a budget to get the motor in the truck in a reasonable amount of time. I have kids and a wife, that should tell you something!! Where would I start looking for the kits? Or just the pistons? I am not really wanting a stock motor, I just dont have funds available to make a 408.