Toyota pickup

1989 toyota pickup 22re 4x4 automatic has 213,000 miles. Tires have about 30% tread. I believe has blown head gasket. Blows white smoke when heater is on and heat quit working. Stills fires right up and drives strong. Not water is going in the oil. I have done tons of work to this truck and I’m tired of working on it Newer parts:(within 2 years) warn lock in hubs Cv shaft boots Universal joints in front and back drive shaft Brakes all the way around Brand new gas tank this past spring Water pump and thermostat this past spring Tranny flush Front and back differentials serviced Alternator Belts Flatbed built 2 years ago with hardwood floor The price is negotiable and willing to part out if would really like to sell whole will take flatbed off for lower price.