I used the Marlin recommended radiator and yes, it is from the 316 /318 M10 engine cars (E30s I believe)
I had a 'full house' of louvres around the bonnet and the cooling was marginal (M50 325i engine). The engine ran at a constant 95-98 degrees, kept under control by the thermostatic fan, but I was always a bit wary about taking the car very far in 25degree + temperatures.
I have now fitted a rad from a MK1/2 ford Escort. It's the right size with a 42mm core but I had it modified to suit my pipe runs. Not sure whether it would suit your set up in its standard form or whether 42mm is the standard core thickness, but perhaps it's another option.
And the coolant temp never goes much above 85 degrees, even in last weeks (was it 2 weeks ago??) 37C!!
Nigel
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