F;
They (Chevrolet) made a 3 speed with OD in that era which will 'bolt in'. If you have the long tailshaft, the driveshaft should fit too W/O modificaton(s).
There's a little electrical and a cable to hook up, but It's not difficult.
The hole and your Hurst shifter stay in the same position too. You may need to grind a little off the mounting bracket as It's close to the solenoid.
All the gear ratios your have now stay the same, except for the OD which is a 28% reduction. This would have your engine running -280 RPM per 1,000, or about 2,160 @ 60 MPH with 28" tires and the rear end you currently have.
Hope this helps.
