car running lean with 30 lb injectors UPDATE

If you read before, my buddy's lincoln LSC 5.0L has been running lean. His setup:
stock 5.0 block .040 over
heavily worked E7s (port, bowl, etc
Trick Flow .560 cam
mass air conversion with the stock A9l computer

I tell him to try to get the plugs to read black first, as a previous poster suggested, we dialed in 56 POUNDS OF pressure at idle, then ran it twice wide open through two gears, kill the motor than check the plugs, bone white

As I mentioned earlier, he'd pull a plug out and it looks bone white like brand new. It is an autolite 25 plug. I tell him to swap one plug with my splitfires in my 89 5.0, which is more or less stock. We go cruising with his one plus in my car and one of my plugs in his. Mine are a perfect ash color. We go cruise for 20 minutes to burn in the plug on his motor (with 50 LBS of fuell pressure) than he runs it wide open through 2nd gear again, kills the motor, and checked the plug. I do the same for my car. I pull his plug out of my car and it is still boney white, and my splitfire in his car is still ashy. I'd have figured the plugs would burn off and read good after that much driving and the WOT action. Timing is set at 13. We are going to try to pull the codes (need a test light) again with motor running and see where it is at, as well as I may take my fuel pressure gauge with extension and my wideband O2 and see exactly what its doing. He also has a set of champion plugs that are 2 stages colder to try out. wish us luck

In my old thread, I explained that the guy is strapped for cash and he had to trade down his trick set of heads for some worked E7s. We are trying to get the combo running good until he can step up on the heads later. He has a C&L mass air meter with the correct sample tube.

We disconnected the batt and reset fuel pressure to 38 with the vacuum line pulled. I routed a fuel pressure gauge into the car when we rode and topping out in 3rd gear the pressure only dropped to 35 psi. Is this okay? we didn't get the chance to dump codes when it started raining, but we checked the pressure and it seemed okay, but the car is slow. with his setup:

stock 5.0 block .040 over
heavily worked E7s (port, bowl, etc
Trick Flow .560 cam
mass air conversion with the stock A9l computer
also, ported cobra upper and lower intake
3.73 gear
race AOD trans with a stall
our cars weigh the same
He couldn't even keep up with my stock 2.73 geared 89 mustang. We will pull the codes soon and he said he may have a line on the 19 lb hardware, so we'll see where it does. expect next post to have a lot of KOER codes