I know there are knowlegeable people here as well. However, there are a coupld of mechanics that are always on the cruisersforum website, and they have been very helpful as well.
I would post it on both sites. I am sure that someone would have access to the parts. A couple of the mechanics have even offered to ship parts, if you can't get them elsewhere.
Post it under the engine section!
I just had my 2GM leaking a bit of diesel. Looked like it was the fuel pump, but ended up being the banjo fitting, just after the pump. tightened it a bit and fine now. Was not leaking fuel into the oil / block though. I owuld not pay for a whole new pump either!