So long story short I attempted to drop a new engine in my 99 Legacy OBW. I was unable to finish just due to the fact that it was way over my head and I never should have attempted it. So today I pick it up from the mechanic. When I drove it home I noticed white smoke every once in awhile. Is this a bad sign? I did the headgaskets so I'm afraid I messed up somehow. I drove it home about 10 miles or so and then drove it to Sears to get the inspection. So probably 15 miles total maybe 20 if I stretch it. Any thoughts?