My engine was a Vauxhall red top so slightly different but principles still apply I’m sure. It makes a difference to the performance of the cooler on how close it’s mounted to the rad. I mounted my 19 row cooler behind the rad with less than 2mm gap which is as instructed. I bought a few sets of the mocal mounting brackets and bent them as needed to mount from chassis rather than rad taking the weight. I used an 80’ thermostat but suffered from over cooling on road but it was perfect on track never going above about 105.