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The first thing to deal with is the alternator. The LT1 alternator is way too big. And the support bracket is too tall, it hits the hood. Using the Mazda alternator means dealing with converting it to a serpentine drive and making new mounts. Locating an alternator anywhere else would be a real pain. This was simple, even the F-body harness plugs into it.

I chose to change over to another GM alternator, don't know the application yet, but it's a Bosch # AL655X

I cut the original support off where I have drawn the line to the right of the alternator.

 

Alternator for LT1 swap
Looking up from under the car, you can see that the original alternator bracket touches the hood bracing. The smaller alternator fits into the space to the left of the hood brace. I can easily pass my hand over top. Hood clearance
I simply replaced the old with the new. I'll make up a support to replace what I cut off.
The alternator is now mounted. The bracket was simple to make. A spacer behind is needed to fill the space between the bracket and the alternator. I used a #5060595 belt.

 

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