You're welcome GTA324. I guess you should be GTA415 now
FB Sweden, the APYU is for a 1989 MAF 350 and it's been superceeded. There are "better versions" from GM. Whether or not you can get those bins "on line" is another question.
Also, you could use the ARAP bin. I find that particular bin has better MAF Scalar tables, though it too can use some tweaking.