nlynne,
Your father's situation sounds very much like my husband's was. He had no positive lymph nodes or mets to liver or any where else. The uncinate process was involved and tumor was adhering to the portal vein and had to be 'scraped' off in the words of his Whipple surgeon. A vascular surgeon was called in to perform this part of the surgery wherein a piece of the portal vein was resected and replaced with a piece of the jugular vein.
The important thing here is to get your father to an institution that has a specialty in treating pancreatic cancer; if you don't, the surgeon you engage will NOT be expert enough in this procedure and it has been proved that experience is vital to a good outcome. M D Anderson, Johns Hopkins, Virginia Mason and Evanston Northwestern come quickly to mind but there are others.
Call PanCan for advice (can't remember their number but you can find it by googling PanCan). Also try the Johns Hopkins support board; it's much more active than this one, with both patients and caregivers and all knowledgeable and willing to help.
Sometime treatment prior to surgery is required, sometimes not. My husband did not have any treatment until after the Whipple, then he had radiation and concurrent 5FU for about 6 weeks. After that he had Gemzar for about 6 months, infusions once a week for 3 weeks then 1 week off. Be sure to have his CA19-9 measured prior to any treatment so you will know is treeatment is working. CA19-9 is a pancreatic cancer marker, as is CEA.
Incidentally, my husband had surgery 12/06 and continues to live his life, bowling and golfing at age 77.
Don't waste time, this is a VERY fast progressing cancer. Sending prayers for a good result for your father.
Joan L