WEST ORANGE — It isn’t unprecedented in the NFL for teams to go from worst place to the postseason, and two-time Super Bowl winner David Diehl believes the Giants have the pieces in place for a dramatic turnaround from a disastrous 3-13 campaign in 2017.”You’re going to be looking at a completely different offense,” Diehl told NJ Advance Media Monday at the fourth annual Clara Maas Medical Center Golf tournament, which Diehl hosts at Montclair Golf Club. “Now you have Saquon Barkley, to Will Hernandez, to Nate Solder, and now coming back with a healthy Odell Beckham Jr., you’re looking at a dangerous offense that can do a lot of things.”A lot of people have been talking about Pat Shurmur coming in, and we know the success that he was able to have in Minnesota, but people aren’t talking enough about Mike Shula, who was the offensive coordinator in Carolina who was able to use Christian McCaffrey unbelievably last year. Add that Saquon Barkley piece along with an upgraded offensive line and Eli Manning, a veteran quarterback like he is, I know it’s going to be a completely different season and it’s going to be an incredibly competitive football team.”David Diehl’s advice to Ereck FlowersThe Giants chose Barkley No. 2 overall in last month’s NFL Draft, and came back with former UTEP guard Will Hernandez with Pick No. 34 in the second round in an effort to bolster the league’s 26th rated rushing attack from a year ago.However, Barkley is as much of a threat as a pass-catcher as he is a runner out of the backfield after catching 102 passes for 1,195 yards and eight touchdowns over three seasons at Penn State.Diehl, a two-time Super Bowl champion as one of Manning’s starting offensive guars, believes that Barkley will have a rejuvenating effect on his former quarterback.”Obviously I have a biased opinion about Eli Manning after blocking for him for over 10 years and winning two Super Bowls with him,” Diehl admitted. “There was no greater or fiercer competitive than Eli Manning. The way that he approaches the game, and carries himself in that locker room and off of the field around everybody, you know he has a lot of years left. I think he has at least two or three really good years.