my jdm b16a overheats can it be the headgasket?

i just intalled a jdm b16a with a new headgasket and new seals but my car overheats for sum reason!! i took it performance shop and he told me it wz a bad headgasket, so i took it back to the machine shop and told me it wasnt a bad headgasket or else white smoke would be blowning out the exhuast… the car is running with no thermostat, also the sparkplugs are wet… can sumbody please help me with this!! thanks

thats what happens when u buy a jdm things like that go wrong.