Cracked distributor cap, leaky oil pan, timing belt needs to be replaced radiator flush and possible blown head gasket?

I would say it's worth fixing, if you can do most of the work yourself. The only show stopper is the possible blown head gasket, which often accompanies a warped head and damaged valves. If the head and valves are in good shape, I would repair it and keep it going. Well maintained Civics can go over 300,000 miles.