I bought mine at a fastener shop here in town. I don't remember the sizes specifically, except that they're all NPT. I thought they were just standard threaded holes at first, but no. funny story, actually. I was wandering about this place for about 10 minutes, feeling a bit overwhelmed. this place isn't very well organized and is chock full of nuts and bolts and all sorts of odd bits and pieces. this plumber dude walked in, looked at my manifold for maybe two seconds and said, "You need NPT plugs; they're over here." I was like, "Huh?" he was right

I doubt you'll have any trouble finding a specialty fastener type shop out your way, but if you do, let me know and I'll see if I can pick some up.
I don't have the charcoal canisters. mine were all rotted out. I can't really remember where they go, or how they're connected. one's for tank vent, I think. being a Cali truck, you probably have to be careful about dumping that stuff. I ended up just connecting a small generic fuel filter for venting. feel kinda guilty about that. maybe I'll see about finding a generic type charcoal canister to use.
the distributor is an aftermarket OEM replacement that I ordered through Advance Auto. I tried the LC all mechanical model, but it runs a hotter advance curve. I was never really satisfied with it, since getting my Weber jetted properly took so much trial an error. anyway, I became more interested in driveability and fuel economy while still maintaining decent throttle response, so I went back to the stock distributor. I prefer it. it's nice and smooth, and I can cruise down the highway without my foot in the gas too much. that's the benefit you get from the idle advance kicking in at cruise; it advances the timing under low to no load conditions allowing you to hold cruise speeds with a leaner mixture which saves you fuel.