Mocal also do full kits for the OHV. Had one on my car for years, still good kit, but the Mocal one does not incorporate a thermostat so you use a remote one. Mocal part OCI138 - about £57+Vat, includes adaptor and hoses, but you need to select an additional oil cooler. I used a 10 row in my hotted up 1280 - works a treat. http://www.thinkauto.com/acatalog/On_line_shop_Oil_Cooler_Installation_Kits_26.html
Tony (HA21)
"Ere look - thats one of them Mk2 Vauxhall Cortinas....!!"