Determining next course of action

My name is Tom I have a 91 Accord LX 2.2L gen4 inline 4 cyl. With 179,000mi. Picked the car up for $500 was running with minor mechanical and asthetic issues. Engine has oil leakage and white smoke in start and in accelleration. I replaced all belts @ same time during major tune-up. I could tell the timing was off alittle, but car ran faster with higher than normal torque output so I left it alone. Now the other day car started overheating, I replaced thermostat & waterpump (still overheating) My oil is not milky my coolant shows signs of oil contamination. Basically can I retime properly to fix or have I blown the head gasket or something to that extent. I, ve done almost everything to fix personally owned vehicles and have learned alot I have not done an all points rebuild yet although I am considering my first. I'd really like to see some rebuild pics and vids any where online but can"t seem to find much, and I don't want to pay the (wrong) paysite trying to find tutorials any recomendations