Sorry but no pictures as I do not own a truck with a 4.3, but if I recall right. There should be a hex headed plug just in front of the oil filter. If I remember right it was 1/2" or 9/16". The other one is around the starter.
If you remove these to drain your block, be sure to use some thread sealant on them before reinstalling them.
I will try to get my buddy who has a 4.3 to take a picture for me. Can't promise that it will happen though.
Political Correctness is a doctrine fostered by a delusional, illogical liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end...