Temp gauge goes high/low then stays close to red. I changed temp sensor, fixed melted wires on pigtail, and finally attached my ODB B/t and checked the temp to verify temp from gauge was correct. Car reached 245/250. Just flushed cooling system, installed new radiator, and the car was very thirsty shortly after ODB test. White sweet smelling smoke from exhaust, and coolant reservoir smells of exhaust/hint of fuel. Car originally had water in oil, so I changed the manifold gasket, my gut insticnt told me to just do the head gasket also but being by brother in laws car, he made the call. Was I right in thinking the head gasket?

Thanks in advance

Kabledog.