need some advice on car ,its a 93 classic just had drivers side rocker cover fixed ie gasket ,new bolts and washers .car has been fine since work done a few days ago went to work and car started cutting out at traffic lights car temp gauge hit the roof got to work had a look at oil and was nil on dip stick also hose on radiator underneath was off.put new oil in and put hose back on drove car took it easy then heater gauge went up again after that car would not start.it will turn but not catching to start up can see belts turn ok.how much will it cost to get repaired if the head has gone,and what else could it be?put water in as well.any help will be appreciateted thanks.