Manual shift valve body as well...you'll be shifting every gear every time. Fine on the track, a pain in the *** for a street car plus I'd want a clutch to go with manual shifting that much. ;)
I used to leave my 65 Valiant in high gear almost exclusively runnin around town. It tipped the scales at 2820 pounds with 4.30 gears and had no trouble pullin high gear off idle.