olbob is quite correct.
The Boeing model number 367 was applied to a number of different studies. See
flying fortress | 1954 | 1103 | Flight Archive
Boeing always referred to the Dash 80 as the 707 prototype, the aircraft even carrying the registration N70700 to so designate it.
The KC-135 went by a number of 717 designations, and 739.
Model 717-100A KC-135A 29 built
Model 717-146 KC-135A 68
Model 717-148 KC-135A 635
Model 717-157 C-135A 15
Model 717-158 C-135B 30
Model 717-164 C-135F 12
Model 717-166 KC-135B 17
Model 739-700 RC-135A 4
Model 739-445B RC-135B 10
Grand Total: 820