The oil filter you need is a Wix 50001. As far as the oil and gas lines, i have some pictures at my web site under '51 GMC Project. Another thing you need is a copy of the factory assembly manual. Its for a Chevy, but it will still come in handy. Also, go to the following web site: oldgmctrucks.com
This has a lot of the information you are looking for. Best of luck, Cecil..........