Pieces of a puzzle

[TugOwar]

Hello fellas,

Maybe you can help me finish a puzzle. Brought home a 68 GMC yesterday.

The guy I got it from took the front of the engine down to the timing chain to replace the timing set, that was 3 years ago. The hood has been down in that time but most of the parts have been laying in the bed or in the bed tool box exposed to weather. I spent today cleaning up parts.

Here is the puzzle part though. I didn't take it apart so I'm not exactly sure how it goes back together. Here are my most immediate "missing pieces".

Crank pulley - is there just one pulley with 3 grooves? I ask because I have it installed that way but none of the three grooves line up with the pulley on the factory power steering pump. In the bed of the truck there is a flat single groove pulley with several bolt holes, not just the 3 holes to match the balancer, I'm wondering if this flat pulley is suppose to go in between the balancer and the 3 groove pulley? This is a SBC (supposedly 305) and all I need to drive is the alt and water pump.

Missing piece #2 - The guy had the distributor out of the truck for some reason. Fortunately he had stored the distributor in the house but he had removed the "module" out of it. I say "module" but I don't know what it's called. It's a small, flat, plastic, black box. Both ends of it have male plugs that go to wires in the distributor. And it is held down by two small screws. These screws are what I need. He handed me the distributor in one hand and the module in the other, but no screws. Will I find these screws at a parts store, hardware store, or must I visit the junk yard and swipe two from another distributor?

Any and all help is greatly appreciated.