After staring at the location I installed it, I decided it was way too high. I did the worlds WORST counter bore for the upper outside most bolt since the nut would interfere with the cylinder head when I moved the outer head bolt to the lower location. It like this location a lot better.
And here's the world worst counter-bore. It works though, everything is VERY close to touching.
Someone on another board asked me why I didn't just get a bracket from car Y and space that out and use a late model alternator.
I had a known good, fairly expensive Powermaster one wire alternator already from my previous SBC/BBC installs. Also already had the BBC alt bracket and the adjustable rod. The aluminum was basically free to me, just had to do someone a favor for it. So I am out labor and the $10 or so for fasteners. Oh, plus the $5 pulley. I think I'm making out like a bandit and my electrical setup stays exactly the same as I had it before.
Side by side before and after.
BEFORE.
AFTER.