Hello i have done the same setting since 20 years, because i am in the south of France. C20XE injection catalysed Bosch Motronic 2.8 old 3 row copper radiator ,no oil cooler exhaust manifold insulated all seems to be right. ignition plugs are well colored french MOT emmission control is ok even at Idle often the water temp reach 90c and the oil temp reach 90 100c when we are in fast road or hillclimb . i have a question too ,is an alloy radiator really intresting ? thank you