6.1 Swap Won't Rev Past 3K HELLLLPPPPP!!!

Can you read any codes off the PCM? (assuming it's a factory computer) sounds like it's going into a limp mode. Have you attempted to reset the PCM? (ease any codes first if possible) remove the ground from the battery and turn the key on (to power up the PCM) then wait about 1-2 min turn key off and reconnect battery and see if it helped. If not read codes again and report back. If you want a fresh set of eyes on it let me know and I could meet you some weekend, and look at it with you.