Looking for an EJ255 crate motor for my 06 WRX. I need to do a valve job on my current one and I'd like to do a swap so I have a Spare. I don't really want to pay too much but I don't expect it to be cheap either. I'd like to go with an EJ257, but I have no idea what mods I'd have to do to get it running. Any help would be appreciated. Thanks!