thermo is great, makes big difference, as you can turn it off most of the time (or even better wire it with a thermostat to turn itself off)

i have seen 10" in front of the rad being sufficient if the rest of the cooling system was up to scratch

but being a bit further up north i would be trying to fit a 12" to the back, supercheap sell thin ones and they are reasnobly priced

i would think you should be able to fit one, depending on how your engine is mounted i suppose