Will 3G alternator fit in stock position of 68 galaxie with FE 390?

Has anyone put a 3G alternator on a 390 in the high mount position? I'm really tired of my fitment issues i'm having with my GM10SI case. The bump on the back hits the head of the motor. I'm not interested in going to the low mount style as i'd like to use the original brackets as much as possible. I measured from my bracket to the block and its extremely close to if not slightly more than 4.5 inches. The dimensions off of summit say from the mounting surface to the back is 4.5 inches.