D9S would be the plug and play ECM. The stock ECM will NOT run the HO engine.
Also, you'll want to replace the shift governor in the transmission and the torque converter with a 2300-2500 (or up to 2800) stall converter or it'll be an even bigger slug off the line until you get into the 2500+ RPM power band of the HO.
Also, you'll want to replace the shift governor in the transmission and the torque converter with a 2300-2500 (or up to 2800) stall converter or it'll be an even bigger slug off the line until you get into the 2500+ RPM power band of the HO.
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