340 4 barrel hasn't ran in 15 years need help.

Make sure theres no water in the oilpan, and that there is water in the cooling system.
Like said turn the engine over by hand,while the pugs are out and after the oil was squirted in. Several times. If it has a sticky spot,STOP.Find out why. It may be stuck valve(s). Do this before spending time on much else.
Change the oil as soon as the beast is proven to have survived its hibernation .