Grounds -
There is the main ground from battery B- to the engine block.
There is the "ground strap" from the rear of the cylinder head to the firewall (and this thing should be thrown away out of hand, and replaced with a cable rather than another open braid. This is usually the first ground to fail, as the weave gets contaminated.)
There are a couple "accessory" grounds in the engine bay in the fenderwells - but I can't tell you precisely where. They're pretty easy to spot, tho.
I often recommend finding all grounds, cleaning the lugs, removing paint from a small patch (a little less than a postage stamp) of metal, and reassembling. Coat with Ox-Gard just prior to assembly. Do this on EVERY ground - especially the strap on the firewall!
Also, while you're making/getting cables, you might want a small cable, about the same gage as the battery cables, that you can run from B- to the sheetmetal somewhere handy. This will improve things markedly - I don't list them on my available cables, since everyone wants to put them somewhere different. You want one? I'll make it to specs - tell me what length you want and what lugs.
Check to make sure the starter mounting area is clean, and that the patch where the engine ground attaches is also clean. Obvious, but also often forgotten...
5-90