Here's a couple of pointers. On the crank remember there are two points where #1 cylinder is at the top. One in the compression stroke and one is the exhaust stroke. Therefore you want the crank on the zero mark when the timing chain is in the correct position. If you have already put the timing cover back on you have two options. 1) Guess 2) Rotate the balancer with the spark plug pulled until you can make sure the #1 cylinder is on the compression stroke. Now remember the distributor cap only goes on one way. Get a Sharpy and mark the plate where the #1 cylinder plug wire is going. Double check it to make sure you aren't 180 degrees out. BTW if you haven't run the engine in a while, I highly recommend you prime the oil pump before starting. I'm not exactly sure what types of drive shafts they have on Pontiac V8s because I have an OHC. If it is a hex rod, DO NOT use a socket with an extension on your drill. If the socket comes off and drops in the oil pan you'll be cursing for days. Bite the bullet and buy a nut driver that can't fall into the pan. On the OHC its like a big flathead screwdriver. After priming, slip the distributer into the hole. You want it to fall on the Sharpy mark you made and where the vacuum advance is correctly positioned. Snug it, but leave loose enough to rotate. Get your timing light setup before hand, start her up and adjust the timing. Having two people at this point is a good thing.