5.9 magnum with M122 blower/intercooler

Thank you for your response. Looks like the correct M90 generation is 5, 04-07 Grand Prix. I accidentally ordered Gen 3, but luckily was able to cancel it at the last moment :D
Did you tig weld the 2 wrong holes? I am thinking of just filling them with JB Weld temporarily so I don't invest 1500+ into TIG for now.

I wonder if it is ok add an inch or two of spacer to fit with the pulley I'm getting... Will show a picture once it arrives!

Let's see if I somehow manage to pull a similar build off with no access to machines, going to be an interesting challenge!