The dorsal designs could not meet even the minimum range specifications.
Gee I wonder why
I'm not sure what the engines would have been, the nacelles don't match the Vipers of the civil version, nor the later Garrett turbofans.
I'd be willing to bet they're Tays, as fitted on Gulfstreams of the era.
If this was actually built, the E-2 Hawkeye would have a competitor in international sales, if it gets exported.
Well there's the whole line of arguing that came but they probably would've bought the one up for consideration, which had front/aft radar sets and looked as literally as a flying pig as perhaps any fixed-wing airplane ever got.