A slant chop would have the effect you want.
A tail-dragger stance would IMHO add drag, unless there is a full bellypan.
The more general question would be forward, neutral or reverse rake.
edit:
There is
ecomodder.com/forum/showthread.php/deep-blue-suburban-streamlining.
He is adding plan taper. I think it's more work than a slant chop. Last post in December.