Big 3 help

I was doing the big 3, and only got the battery negative to chassis done, and the alternator positive to battery positive done. I did not get to do the engine block to chassis yet, due to not having a big enough socket to complete the job right now.. the socket set I have to loosen the last bolt is 1 to 2 sizes too small, so I gotta wait until I can either purchase the needed tool, or find someone to let me borrow theirs. So my question is, is it ok if I drive the car around for a week or two or something with just 2 of the 3 wires done on the big 3 for now, or is this really bad to do?

 
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I included a pic of what the area around the alternator looks like in the engine bay. Would I be able to run my 3rd ground to the bolt circled in red? Would that work instead of the engine block? It's a 1/2 thick metal bracket that seems to be attached to not only the alt, but to the entire engine. Also, would it matter if this ground is longer than usual(3-4 feet)? I was gonna mount it right to where I have the first ground mounted on the chassis. This would save me alot of aggravation if I can do it this way, because that bolt is the same size as the alternator positive, and I have a smaller socket set to remove it no problem.. Thanks in advance.

 
Here's some actual pics of what I'm working with, and my finger pointing at the bolt in question here. Not sure why it uploaded the pics sideways, sorry if that confuses anyone.

 
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If anyone could please help answer that, that'd be greatly appreciated. Thanks //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 
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Ace87

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