I hooked up the AEM UEGO today and confirmed my what I suspected. It's extremely rich all throughout the rpm range. The A/F ratio bounces off of 10.0 (lowest richness that it'll display) and 10.2 even with the idle screws almost all the way in. Full throttle stays at about 10.5-12.5. I think the highest it ever got was 13.5 or so after 10 minutes of driving in all gears and rpm ranges. It did spike to like 17.0 in a floored 3rd gear pull. It never did it again though. I floored it again in 3rd and it stayed at around 13.0.
69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.