I like to post retarded questions...
A friend of mine had a 71 Challenger with a 6-71 blower with dual carbs on a 340 sticking through the hood. Don't know how much power it made but it was quite streetable and he had a hard time keeping back tires on it! ;)
Another buddy of mine is in the process of putting a pro-charger on the crate 360 in his 69 Dart. This is a centrifugal type blower, not a roots, but the kit came with all the brackets and plumbing and it fits under the hood.