Anything special in removing the lifters? I'm probably going to get this blocked bored, but not sure how much over yet. Doesn't this change my CC ratio? How do I determine how much to bore it, or will the machine shop know that answer? Seems this is my cheaper route, then to replace the motor. Should I replace the crank? I've been told, the only difference between the 351M and the 400 is the crank. I'm also going to get my heads all rebuilt (valves, springs, etc).