I kinda agree with slayer, doesn't sound like the po did it any good, but don't get desparate yet. Run a compression check, and check the oil pressure. How does it run?, in any case run the checks.You want compression around 100 psi and no cylinders more than 10 psi from the others. Oil pressure not much less than 20 pounds at idle. If the checks are good. You can pull the pushrods and clean them out. Run several sizes of piano wire thru them.
Larry
68 C20 327 daily driver
63 C20 292 Camper truck
65 C10 ? Custom Cab AC,PB,PS,$flasher
