White smoke on cold starts

[Mr.s13r]

Just finished the sr swap like a month ago and now on cold start about 32- 40F outside i see a lot of white smoke. Coolant level seem fine though. Is this my headgasket going bad? I have my water temp connect to the upper rad hose and it read 0 and the stock gauge will read half. This is when i try to rev it to like 2rpms and see a lot of white smoke coming out of my exhaust. After driving a little and everything really warm, my stri temp read 180-190, i let it idle again and don't seem to see anymore white smoke. Is this a problem i need to be worried about? Also this have the stock t25 if that makes any diff.