You could also try and find a Ford FE alternator bracket that was used with engines that had a smog pump over the alternator. It mounts the alternator lower and there might be more room that way. Part Nos. are C8AE 10156A and C8AE 10145B, there are other part nos. as well but those will get you going.
These brackets can be hard to find but I got mine off an ebay auction looking for "Ford FE low mount alternator bracket". Paid $30.
Another option is this one:
http://www-link.com/cgi-bin/odbic.ex...lientno=1681.0
Go down to the 3rd and 4th items for the Alt. brackets. Their a little pricey but very nice looking.
Good Luck.
Paul