The front profile of the 176 reminds McDonnell XP-67 a bit because of the blended wing. Is that "6-19-40" the date of photographing the plans or the date of producing them? If the former, would have been interesting if Martin had proposed this to the USAAF instead of 179 which became the Marauder. OK, Marauder had twice the range and double the bomb load than Maryland/Baltimore, but the extra space in those THICC wing roots and reduced drag could have made 176 competitive range-wise and Marauder was often flown at less than full bomb load to extend the range.
The blending, and laminar aerofoil profiles of nacelles/fuselage, on the XP-67 turned out to not
give the hoped for results. In the case of the Model 167proposal it probably would have had
greater drag, both profile and parasite, than the Maryland.
It was an interesting notion, but the blending really didn't make sense on the piston-engined,
prop-driven aircraft of the period.