If you got the Hurst Indy, I've never seen one that was any good, 3 0r 4 speed. Have you checked with Patricks? They've got a shifter for the Saginaw that's specifically for use in the AD and TF trucks.
BTW, Hurst and Mr.Gasket are the same company, Mr. Gasket bought out Hurst some time ago, mid-'80s, I think.