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The simplest thing to do is get the right computer from a 302 Ford Mustang, the engine & injector wiring harnesses, and the MAF sensor and air filter and just swap them out. You can get all this stuff off of eBay. Warning of course is that people often eBay off parts because they don't work! Especially MAF sensors it seems.
The part which ISN'T simple is that the 302 intake has those 2 hoses in the intake. This is hard to attach to the big hose to the MAF! There was an ideal factory-made "Y" hose but it was discontinued and is an extremely rare and largely unobtainable item. Some people have swapped the intake throttle body for the big oval one off a Ford Lightning, problem with that is the Lightning intake does not use the Idle Air Control solenoid and that's essential to making it run.
The other prob is the Mustang MAF computer expects 2 Oxygen Sensors, and the location of the one that is there won't work for either one. Some people say to tie the wires together and use the one sensor, but it's not right, that computer adjusts both sides of the engine indently based on that sensor and it's going to be impaired by this deception. You really need to have a guy weld a bung onto both sides of the exhaust Y for O2 sensors and then put a plug in the old hole.