k, this is a good question.
a few people have made thier own blocks and plates to move the axle FWD. ne being BadDog. he has pics in his thingy i think.
anyway, i used ORD zero rates. then since im using a 2 inch longer shackle, and needed to move the hole in the spring plate fwd as well i decided just to buy some shimmed spring plates.
anywhoo. you would be better of using zero rates of one type or another. this is a good time to look into shimming if needed as well.
Grant