Look into California Air Tools, they make unbelievably quiet air compressors. We just bought two 1hp 4.5 gallon compressors from them. I know this is smaller than whats needed in a garage but they run at 60 decibels, its incredible.
Awesome Thread Brent! I really enjoy it, I too love the old era correct hot rods. You gotta make a trip out to The Race of Gentleman in Wildwood NJ one year.
I have the 50K in a 600sq ft shop and wish I would have went bigger. I'd like to switch but don't feel like redoing the vent for a 4". Go with the 80K or 125K