I found this online. I guess it is ok to copy and paste here.
"1980 Road Runner
Available on model HL29 Volare 2 Door Sport Coupe...........$4,872.00"
"A57 Road Runner Package - NA W/A04 Basic Group, A42 "Duster" Coupe Package, A53 Two Tone Paint Package, A63 Custom Package, A64 Premier Package, A72 Sport Appearance Package, J46 Gas Cap, K6X, M26, M31 Mouldings, S87 Steering Wheel, W11, W13, W15 Wheel Covers, Vinyl Roof or Other Mirrors - S77 Power Steering Required.........$586.00
Includes: Rear Air Spoiler - Bright Sill Moulding w/Black Surround - Grille Black Out Treatment - Black Headlamp Surround Windshield, Backlight, Drip Rail Mouldings & Windshield Wiper Arms - Road Runner Name Decals - Remote Control Dual Sport Style Mirrors-Painted Body Color - Road Wheels-Styled Spoke - Heavy Duty Suspension - "Tuff" Steering Wheel - Unique Black Gas Cap"
The largest engine listed is: "E44 5.2 Litre/318 CID 8 Cyl. 2-BBL - Torqueflite Trans. (D34), Power Steering (S77) & Power Brakes (B41) Required - NA W/N95 Emission Control System & Testing........$87.00" or "E46 5.2 Litre/318 CID 8 Cyl. 4-BBL - Torqueflite Trans. (D34), Power Steering (S77), Power Brakes (B41), & Emission Control System & Testing (N95) Required.......$142.00"
N95 is California emission equipment, which cost another $254 on to your Volares sold there. Standard engine was the E24 3.7 Litre/225 CID 6 Cyl. 1-BBL, with or without N95, depending on were you lived."