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Stock = Bosch or Lucas is good, Ford MotorCo is good.
2 major design differences are older Pintle-style, and never Multec style injectors. Multecs flow 'smoother', bit better idle, BUT.. do NOT like very high FuelPressures, so if you are planning on Forced Injection with an FMU, Multec's are a NONO..
I am running a set of 24lbs Multecs off of an LT1 (since mine were 24lbs stock I needed someting with about the same flow) and my idle has gotten smoother, slightly better gas mileage when I put them on few years ago. Had them up to 58psi without problems just to test them in the past. They were fine, but wouldn't push my luck to like 80psi or so with an FMU.
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Per rich over at cruzinperformance, the multecs are unreliable, and not worth cleaning. He cleans/refurbs/matches injectors all the time. Go with gm early plastic tip style (bosch) or ford(also bosch)