You want to run these rockers because you already own them and you don't want to spend the money for new ones right? I don't blame you! I'd do the same thing.
If you shim the rockers on the shafts so they stay centered over the valve tips, I think you'll be just fine. You always have to check to make sure the pushrods don't hit the heads, but you have to check those things anyway. I bet they will clear everything just fine. Some aftermarket rockers are .800" offset. Ones that are .400" offset are designed to take any pressure from the offset. Go for it.