1. Heater and AC dont work. Its blow air though.heater core?? I can smell coolant in the cab sometimes. when heater or ac is on
2. Driver side front tire wires are showing towards the inside of the tire
3. I dont know rhe history of this truck as far as services. Would you recommend a diffrential flush and transmission flush. Vechicle is at 257,000miles
4. Fuel filter, belt, o2 sensor,
5. Im unsure about head gasket replacement. And intake manifold.
What specific order shall i go ?in or what shall start with?
It's your money, but I think you should FIRST do some basic tests to see if it is worth restoring - a wet/dry compression check, a pressure test of the cooling system to see if there is a blown head gasket, jack up the truck and check for play in the suspension and steering. You might be better off finding another candidate for restoration and/or getting a wrecked F150 with a better engine and transmission.
Well Scotty recommends this kit for pressure testing your cooling system https://www.amazon.com/dp/B0002SRGWU/?ref=exp_scottykilmer_dp_vv_d and this for compression testing https://www.amazon.com/dp/B000EVU89I/?ref=exp_scottykilmer_dp_vv_d
He has videos showing how to do these procedures. Now, they cost like $100, but it would cost that much to have a mechanic do that - and you wouldn't have the tools to do it on the next car/replacement engine.