I think if you used the alternator bracket from this kit you could have kept everything else. This appears to move the alternator in and up about 3/4", as close to the block as possible. That said I didn't find just the alternator brackets on their site.
https://www.ictbillet.com/ls-truck-...ring-pump-bracket-lsx-ls3-lq4-lq9-billet.html
I bought the L99 Camaro stuff so I have the same problem, but I am not chopping up the hood for clearance. If I have to I'll just make a bracket, but there's not much room left to move the alternator in the stock position.
On mine the stock XJ power steering pump bolts into the L99 Camaro bracket (with different bolts) and the stock lines to the box actually fit perfectly, too. Shame to have to change all that.