Well, not long ago I put good heads, cam, intake, carb and exhaust on stock 72 low compression 340ci. Its in 3 speed manual Dodge Demon. This thing now eats 5.0 Mustangs all day long and I also raced my buddys 94 Viper with 3.55 rear and full exhaust done. We were head to head till 100mph on 14" stock rally rimms with 225 tires. Was stock 240hp car before, full stock bottom end, about 9,8:1 compression now.