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1987 Model year, L98, I am missing a bolt from one of the engine accessory brackets, the triangular one that supports the smog pump. There's a bit of a gap behind the bracket, between it and the engine block.
I've attached a couple of pics to illustrate what and where I'm talking about. Power steering pump pulley at the bottom, smog pump pulley at the top of the first pic. Second is a bit more zoomed out. Going to hit up Napa and see if I can't track it down while I run errands, but that's been hit or miss for me in the past.
Not particularly technical, but figured this was better than General Discussion.
Our Napa has a huge book to look up any kind of fastener you would want. it actually has samples of the bolts attached to the page and not just a picture. All that fails remove one of the other boats and take it with you
Use something to measure the depth of the bore. The thread will be 3/8-16 likely and a potential length maybe 2 1/2". 3/8-16 flange head should be available locally for sure. Flange head is certainly desired.