Hmmmm... How much down time can your V-6 have?
What about trying to find an Thunderbird SC engine? They have an Eaton roots positive displacement blower on a 3.8L V-6 stock. The SC has is a much beefier assembly, maybe if you could find a lower mileage one you could drop it in there? They make 240hp and 300something lb/ft of torque.
That should be good enough for mid 13's.
Or you could probably just yank the SC off it and go to town. They should be relatively interchangable? Anyone try that? I think they make eigher 6 or 8psi. That outta get your V-6 into the 260-280hp area.
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