I think that timing and vac advance are in relation with each other. you need to set the timing in the factory spec first then check the advance with the proper equiptment. the heating problem could be that you have the [even though is recomended] wrong thermostat temp. the gas used today is different making the engine run hotter. the combination I use is 160 therm and a factory fan shroud ,6 blade fan also a 4 core radiator and a lower baffle if necessary. if you done this and it doesnt work; then the timing is at fault and carburator is out of adjustment. running too rich [or has a vacummn leak] will make the motor run hotter. you might try recurving the distributor also.