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

Sounds like the pcm doesn't know its in gear so it is in park rev limit

X2 was the ecu out of an automatic equipped vehicle. You'll need to get one from a stick or find a way through the schematics, possibly a single throw switch controlling a latching relay to convince your ecu that you're in gear each time you start. Might be easier to find the correct ecu.