Yes, just wrap/place them on a metal heatsink, using thermal paste or thermal glue. Leave some space between them, like Nigel said.
I'd use 14 10 Ohm resistors, in parallel, to get 0.7 Ohms. So that you divide the 75W among them, each one will dissipate about 6W in this configuration and, individually they won't get too hot, but the whole pack will dissipate 75W, so they will get as hot as an incadescent light bulb. (75W was stated in the schematic posted on the other thread.)