I bought one off Ebay for a 235 six in my 55, cools well but most of these require some mounting fabrication. I used a plastic six blade fan from a local speed shop to give more clearance and cooling. I will link some pictures in photobucket if you want me to.
Larry
http://www.ebay.com/itm/3-row-aluminum-radiator-chev-55-56-57-pickup-truck-1956-/110724575339?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D1157189704797234240%26pid%3D100015%26prg%3D1006%26rk%3D1%26#ht_3582wt_1163
