I'm still new to the tuning thing and I'm due for emissions test. Recently put a 383 with cam, aluminum heads, and ported throttle body in my 93 K1500. Has no EGR passages. Test is on rollers with a sniffer on tailpipes. I took it through last weekend and HC, CO, and NOX all were over limits. Not by much, but I could use some help cleaning this up. I did my best to clean it up and I'm going to run it through again here in a few minutes. I'll have a data log to upload if it fails again. I'm running on $0D.

Any tips? I don't care how it drives, as long as it passes the test, I can turn it back as soon as I'm done.

I do have cats on, although they might not really be big enough for this engine. If fail again today I will have to pay to retest, which isn't a big deal ($17). I have till the end of the month, before I start running into real issues with it.

Thanks in advance