After my brother recently bought an '86 P/U 2WD 22R w/150k, and shortly encountered a blown head gasket, I've been learning a great deal about these trucks. Enough to want one of my own to "work on". Well, I found an '87 P/U 2WD 22R w/113k, that is very clean inside and out with five years of repair/maintence receipts. It had a complete paint job about seven months ago, and looks great. The only known problem-set is that the engine knocks quite loud, is loosing coolant, and has white coolant-smelling smoke coming out the exhaust. I had build up enough confidence to do the head gasket/timing chain job (which is what my brother's truck needed), but now I'm afraid that I'm looking at a bigger repair with this truck. The oil seems pretty dark, but it doesn't appear to have any coolant in it. I only paid $700 for this truck, so I have a fair amount of head-room from an investment perspective, but I just wanted to ask for some input on what is probably wrong with this truck - given the symptoms - and what may be my best approach at tackling the problem.