Good advice posted above, it appears Yarddog1950 is becoming our GM expert. I was also going to mention that the crank pulley was probably going to give you the most trouble and having the special removal tool makes all the difference. You might also consider replacing the water pump at the same time since you have to remove it anyway. Also the original gears had a nylon coating to keep things quiet, I think you’ll find that it’s this coating that has worn away causing the slack in the chain, you might consider replacing it with a set that does not have the nylon coating so that it lasts longer. Another thing to consider is replacing the cam and lifters while you’re in there as it’s just a few more steps such as removing the intake manifold. I know were’ just about rebuilding this thing at this point but it’s just something to consider.
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