A grill block is good, I noticed significantly quicker warm up times when I added mine. Also, if it gets really cold there, you may have so much cold air flowing past the engine that it won't stay at operating temps without one.
Remember that defrost will turn on the A/C, so don't just leave it on defrost all the time.
If you don't already have it, synthetic gear lube in the tranny and rear end. The colder it gets, the more important this gets. A little more extreme than what you likely see, but a while back I remember starting my manual tranny truck at -40°F (-40°C) and I was going to let it warm up while I scraped the windows. I had it in neutral and let off the clutch... and it lurched forward and died. The fluid was so thick, that it wouldn't run at high idle even in neutral. Switching to synthetic solved that.
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