The individual race, which also has French and Great British national team members in it, had attracted 93 entries last week, with another 219 surf athletes taking part in the teams race.
Notable teams include the Sassy Tsunamis, with triple surf life saving world champion Laura Quilter roping in Olympic K4 kayaker Kayla Imrie and top ironwoman Natalie Peat (Papamoa), while previous Olympic kayakers Teneale Hatton (team) and Mike Walker (individual) will also compete.
The Monster starts and finishes on Mount Maunganui's Main Beach, with a 5km beach run, a spectacular swim leg which includes a jump off Moturiki Island's blowhole, a 12km ski leg to Omanu and a 6km board paddle.
Lacy is currently 10th in the Nutri-Grain standings in Australia after three rounds, having finished second in Fingal Bay last weekend, while Cuff is 11 spots back.
Their Mermaid teammate Simon Murfet is 14th, although he and Hamish Chapman will line up in a team for the Mount Monster.
McKenzie missed the first round, competing in the world paddle boarding championships with Shergold, but did enough in the next two rounds to lie 27th in the iron woman standings, fifth in the board standings and sixth in the ski.
The Monster also features a unique prize money split, with $1000 going to the first open male and open female and a 'Monster Pot awarded to first overall in the male, female and teams, based on the number of entries in each division.
■ Racing starts on Saturday on the Mount Main Beach at 10am.