A Pontiac distributor will sit in the block anywhere you want it to. The only thing that dictates where it sits is how the cam gear meshes with the dist gear and what position the oil pump shaft is in when the dist is dropped in. It's not keyed in anyway. You can manipulate the oil pump shaft with a flat screwdriver so the button will face where you need it to. With that said, as stated before a Pontiac fires at either straight up or 180* out as both #1 and #7 cylinder are at TDC at the same time. When you turn the balancer so the timing mark is at 0 you are firing on #1. The button should be at roughly 1 o'clock. As I stated before, the distributor itself will drop in anywhere. You can turn the oil pump shaft so it is turned so it will mate up with the dist gear. Make sure your vac advance won't hit the intake manifold. I've had this argument with many people. I do it all the time.
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