1991 Mazda B2200 91 Mazda B2200 white smoke from tailpipe

My 1991 B2200 I bought with a supposed blown head gasket is still smoking. I had the head redone, ground valves, new seals, checked for cracks and resurfaced. There were no cracks in the cylinders or as far as I can tell on the deck the head mounts to. I replaced the intake gasket and carburettor gasket. When I got the truck, it didn't run at all, after I did this work, it runs smooth but pumps out enough white smoke at any time over idle to make a visible white cloud about eight foot long and four foot wide. If I drain the cooling system and start it, there is no smoke and it idles better than it does with coolant.