That intake is from a late 80s early 90s crown vic/marquis. I took a 302 apart from that era car and it had the same grey color injectors (majority of them are yellow) and the intake cover plate says efi 5.0. It did not come from a H.O. car, but it is the same intake and injectors.
It will hook up with any standard 5.0/ 302 fire order computer wire harness (you must rewire the injector harness to match a 351 fire order if you want to use it on an H.O. system)
They are good intakes for low to mid speed torque.