351W to 400
It costs $350 locally to have a crank offset ground. Machining the counterweights is by the hour. You can grind the counterweights with an angle grinder - I'm sure you can machine the same amount off of each with your eye so that the crank will balance evenly.
It's way cheaper to just buy the right part, either a properly modified crank or a Scat model.
1967 Falcon 4 door 351C - 70 Mustang 351C
Owner built, owner abused.