AFR in the 10's at idle and light throttle cruising

[LarryJoe]

So I've been fighting an issue with this 90 GSX running super rich ever since I got it. I bought the car completely stock and so far what I've done is Drop Engineering mounts, FP manifold, rebuilt small 16g, PR 2.5-3" o2 housing, PR 3" downpipe to a 3" cutout, and an AEM Wideband. I've done boost leak test and came up clear. I replaced my front o2 with a brand new Denso unit. Also tried a Bosch unit. I'm logging with a palm emulator and my coolant temp sensor is functioning as it should. I thought I found the issue the other day when I discovered the car actually had Lucas 550cc injectors. So I got a plug and play adapter for a 2g maf and installed it hoping to get the AFR's back in check. Well after installing the 2g maf and resetting my fuel trims absolutely nothing changed. Still idles in the 10's on the wideband. Except now it runs really lean under boost but I assume I'll be able to tune that out when I get my safc. I also pulled the vacuum line from the fpr and there was no fuel in there so I can only assume mine is functioning. Any help would be appreciated guys.