How to check for a blown head gasket

[Tippey]

When it comes to head gaskets i feel this is the right place to ask even if its not for a legend

The car in question is a 1993 accord

basically the idiot owner has been driving the car around for 2 weeks without coolant and over heated it many times. I put coolant in it and bleed it, it still leaks out the radiator ( slowly ) and still over heats

I've also seen it put white smoke out the exhaust but it comes and goes. When he was nearly out of coolant it was pumping out white smoke. When i filled up the coolant and fixed a bunch of crap it seemed to have stopped

So where should i begin for checking if it has a blown head gasket?