I brought my 03 5.4 EB to the shop so that he could look at the fuel gauge, which was reading a quarter off after he replaced the fuel pump. He calls me the next day to say that the water pump is bad and that I need to replace the water pump and thermostat, and quoted me 1100 dollars. He also said that the head gasket was causing high pressure in the cooling system, which he thinks caused the water pump to fail and the induction manifold (which has been leaking since 2020) to leak. Furthermore, he said that at 270k miles, things are just going to keep breaking, and that he isn't going to service the vehicle anymore, and that I should sell it as is and buy something else.
I've had the car my whole life and am willing to put as much money as it takes to keep it running forever.
My question is two fold: is it possible to keep the car on the road to a million miles
And ballpark how much would it cost to preventatively replace everything that is prone to fail
(he also said that this car should be a local errands runner, but I want to be able to confidently take it on the road in the summer, every summer I put 10-12k on it visiting national parks)