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I used to have cooling issues like this on my old XR2 turbo, I fitted a 13 row Mocal oil cooler with a thermostatic take of plate, but I did retain the standard oil/water heat exchanger with a shorter but wider cossie 2wd oil filter, this with 5m of hosing with the cooler itself added an extra 900ml of oil to the system, also I fitted a standard 2wd cossie rad (which just fitted between the headlights) and the hosing from the stat housing to the rad via a swirl pot was over twice as long by adding longer pipe work, this added almost 2 litres extra water to the cooling system, after that I never had an issue, more water more oil and bigger cooling surface area seamed to work a treat.
I've put a cossie rad in a Mk4 escort just to see if it fits and just goes in.
Ginger
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