Don't go to pistolgrip727, go get the best out there 
www.harmsauto.com There's are tilt grips with NO trigger. Yes they will fit straight on to your 71-74 shifter.  
 
 
I'll be getting one. To engage gears you give the handle a decent push down and shift back or forward, thats it easy.
They cost $300 USD but they can make you a custom handle, want more tilt? They'll do it, want a different shift pattern up top (PRDN21) They'll do it.......for an extra $30. 
I think there a great shifter and if you don't like it, just send it back for a free no questions asked money back return!
Sheesh does this sound like an add or what LMAO!!  

 Anyway that's my opinion............ 
 
  