Ford 8.8 gear swap shop?

I have a 2006 Grand Marquis I'd like to have a gear swap and posi put into. The car is super clean, currently a 2.73 open diff. I have a yukon posi and gear install kit, I was thinking about grabbing some Ford Racing 3.73's gears to go into it. I'd like someone to install these that really know what they're doing. I could, but I just don't have the time or experience. The car only has 60K miles or so, so I want something that should be hassle free for the next 10+ years or so. Any recommendations?

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Detroit Gearbox here on the site, or Ring and Pinion shop on Groesbeck in Clinton Township.

Ring and Pinion

Thanks guys!!

Damn that is super clean. Love it...