8 1/4 rear end 2.45 gears!

I was just talking to a friend of mine tonight. He has a 78 Dodge Magnum that had a 360 with the 2.45 8 1/4 Sure grip. He installed a healthy 440 with those gears. He said he had no problem winding the speedometer needle all the way around way past the numbers. He said he still had a lot of gas peddle left to go.