Assuming that Gronk, Cooks and Edelman all stay healthy ...
Based on a 600+ passing attempt season and previous "high-passing" seasons' target distributions, I'd project Cooks, Gronk and Edelman to finish with around 100 targets, 65-70 receptions and 900-1000 yards each.
Then, White, Hogan and Mitchell would see +/- 70 targets, 45-50 receptions and 400-500 yards each.
Allen, Lewis, Burkhead, Amendola would then divide the majority of the remaining +/- 100 targets among them.
Again, based on previous "high-passing" seasons, I'd then project +/- 450 rushing attempts for about 1900 yards and 18-20 rushing TDs. The "lead rusher", presumably Gillislee, would see +/- 190 carries for +/- 800 yards.