5.3 running rich!

[84bruiser]

So I swapped a 2001 5.3l/4l60e into an 84 c10. The swap was easy! My only problem is that it runs rich. It runs great while its cold but once it hits operating temp. It runs really rich!! I changed the o2s, and maf! I even took my harness off and traced the wires for the o2s just to check everything. Also I am getting no dtc's. I'm wondering if it could be the map sensor?? If anyone has any help or advice its greatly appreciated!