Hello all. Working on fixing the cooling system in the 68 plymouth with a 318 that was passed down recently. Seriously neglected. Wondering after cleaning it all and multiple flushes, once I install the new parts any coolant you would reccomend? I believe it said something about prestone yellow on the radiator cap but can't remember and the car isn't with me. I just ask because I can read what it says but also realize that was 40+ years ago. Thank you.