Does the lp regulator have a vacuum port and line hooked up to the bottom of the cover? This system uses a fuel control solenoid valve to apply vacuum to the regulator to reduce fuel pressure, you will need an oem converter. I have swapped covers but service information says there is no rebuild kit for this converter so there must be something different from a model J or Cobra regulator. I would put on an OEM regulator, check the duty cycle of the FCSV, and check vacuum line routing.