I have recently begun a new project car from a barn find. Unfortunately, information is scarce and wondering if anyone here has additional information. I have a 1984 Plymouth Horizon Shelby Engine 2.2L High Output- it was an option only in 1984. I haven't confused with the Omni GLH or the Shelby Charger. The VIN matches to the high output Horizon, I also have the original receipt for the vehicle with the high output option. The only production numbers I have been able to find total 84 created. Does anyone have any additional information regarding this vehicle and its option? I have been only able to find a few references across the internet. Usual places like the 1984 brochure don't reference it. Thanks in advance!