I missed your 2nd to last post until now and just read it.
No, I have no indications of a blown head gasket. I change the oil every 3000 miles(I have never not done that in 43 years of owning cars) and always stick to one brand and maybe use a third to a half a quart between changes. I have only done one tune up but didn't time it at that time but the tune up consisted of, new cap, rotor, plugs and wires.
An engine swap doesn't intimidate me, the cost does. I've rebuilt a few engines over the years but like I said before, this truck really runs pretty good so I didn't want to put a rebuilt in if I didn't have to.
So now I will make use of your other suggestion and get some Marvel oil for it and the fuel system, when I lived in the states I used Marvel oil quite a few times but in the 30 years since I've been back in Canada I don't see it anywhere and had pretty much forgotten about it but I try and find some.
Again Big Thanks guys.