Armed with a stacked roster and bushel of draft picks, the 49ers traded up 13 spots in the first round last year to grab the player they coveted: LSU safety Eric Reid. This year, the elements are in place for recent history to repeat itself, perhaps right down to the college of the player the 49ers might covet. Armed with a stacked roster and 11 draft picks, including six in the top 100, the 49ers are, again, logical trade-up candidates. And the Niners, in need of a field-stretching wide receiver, have been very interested in LSU’s Odell Beckham, a possible mid-first-round pick, a source told The Chronicle. A possible trade partner? Today, Ravens general manager Ozzie Newsome said at his pre-draft press conference Baltimore has fielded several calls from teams looking to trade up for the No. 17 pick. That pick is 13 spots removed from the 49ers, who surrendered a third-round pick to Dallas to move from No. 31 to No. 18 last year. A few reasons the 49ers and Ravens make logical trade partners: ** It’s safe to say the teams, led by Jim and John Harbaugh, have an open line of communication. In a salary-cap pinch, Baltimore traded wide receiver Anquan Boldin to the 49ers for a sixth-round pick last year. In August, the 49ers and Ravens will have four joint practices after their preseason opener Aug. 7 in Baltimore.