Lorents Greger Christensen Hveding (born 1827)

I'm trying to track down my great-great grand father who apparently went from Norway to USA i 1868. Lorents Greger was born in Dale, Kvæfjord, Norway Sep 20 1827. http://www.arkivverket.no/URN:kb_read?idx_kildeid=9633&idx_id=9633&uid=ny&idx_side=-71 Although I'm not 100% sure it's the same person, from the records at digitalarkivet.no I am fairly sure it's the same man. http://www.digitalarkivet.no/cgi-win/webcens.exe?slag=visbase&sidenr=1&filnamn=em03011867tillegg&gardpostnr=8371&personpostnr=8371#nedre From the records here at Norway Heritage I've found him again, leaving from Christiania (Oslo), Norway, departure to Hull, England 17 July 1868 with the steamer SS Argo. /emigration/passengers/passengerlist/101667/ This is where I'm stranded, I can't find him in any other records (perhaps because he used a slightly different name in US?). I have assumed the journey from Norway to England took about 3 days. I would assume he went further to Liverpool by train, and from there to the port of New York. If the journey from England to New York took about 10-15 days would it be safe to assume he arrived in New York late July or early in August? I've been looking briefly at the records at http://archive.org/stream/passengerlistsof0299unit and http://archive.org/stream/passengerlistsof0300unit Can i assume he would be in there somewhere? I find it hard to read without any clue what (and when) I'm actually looking for. Some written sources says he eventually moved to Chicago, but I have not seen any evidence of this anywhere, nor do I have any idea where they got this information from. I would appreciate any help where to look further. Any hints on where to look and what sources to use.