I don't have that car in a true-length image,so It's hard to 'analyze' it,but I do have the 1976 Plymouth Arrow of which the roofline is similar and lacks very little aerodynamically.
*The Arrow returned 37 mpg HWY for Popular Science Magazine's road test.
*The X-Ray image revealed that the hoodline and nose could be lowered significantly and still contain all the original mechanicals.
*Hucho demonstrated that very little leading edge radii would allow for completely attached flow in the front and it would be a snap for the Datsun.
*With a 'cleanup' you ought to easily see low,to mid 40s mpg.
*I'd give it a thumbs up as a project car.
