[dropd80s]

Finally got my CCSB pulled out of the shop under its own TBI'd power yesterday! Shes an 86 with a 90 sub TBI 350/700 and complete harness swap. Everything stock. My problem is she seems to be running very rich. I have considerable black smoke at idle. I have let the truck warm up to operting temp, and still have no codes stored. Everything is clear.

I am curious if the higher pressure fuel pump I ran (E2000) is overloading the FPR?
I know I need to check and make sure the 5/16" return line I ran is not kinked.
Also, I have no exhaust on the motor, only a few inches of pipe on the manifolds. Could this be cooling my 02 and not letting it read properly?
I assume this could also be a CTS problem or Vacuum leak?

Any ideas you guys have or how I should go about ruling things out would be a huge help. Thanks in advance