OK i got a 93 toyota pickup that did not run. found no compression. when i started tearing it apart found pistons were shot and rings fell apart. I had the whole bottom end rebuilt (bored/new pistons/new crank) got the engine back from t-hoff bolted the head on started into the timing and noticed that the chain that I got from engnbldr.com wasnt long enough. I compared it to the old one and it was shorter. Compared it to one from advance and it was the same length. So my old chain was longer than both. Finally figured out that in 84 there was a longer chain used. Is it safe to assume that atleast my block is older? If so how can i confirm this. Also assuming that the motor is from an 84, will my new timing cover that i got for a 93 still work. likewise with the oilpump, water pump and the clutch? (all new parts that I got thinking i had a motor from a 93) Im hoping that someone has run into this or knows some more about it and can help me.