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@greenjersey
165mm is for sure the crank length. 144 bolt circle diameter is the old Campag road standard and I believe is current on their and many other track chainsets. It will take a ring down to 42t although 48x18 is the perfect riding around fixed gear.
Track bikes often have a 1/8th inch chain and ring/sprocket (slightly wider) but a "road" 3/32" chainring will work OK. TA make good rings in quality alloy.
If you go from 52t to 48t you may well have to take a couple of links out of your chain.