help picking a shift kit...

hey y'all, I'm thinking of putting a shift kit in the 904 that's in my 72 Duster. The trans is out of a 88 5th Ave and has a stock rebuild in it as well as stock torque converter. I don't want anything radical I just wanna tighten up the shifts a little. This is a mild small block street car but these lazy shifts is ridiculous. Where's the hot deal on a kit?