[kalbert]

You don't need to change out the whole column, just get the right gate for the lever from something with a 700 like Insidious said earlier.

The rooster on the shift shaft inside the transmission has detents on it That's what holds the transmission in gear.

The gate in the column is what lets the lever move the full range, also with detents which provide the means to prevent accidental shifts from high gear to neutral etc. without pulling back on the lever. Generaly there's a notch for park, reverse, neutral, and forward gears. Sometimes the pin on the lever that engages in the gate is so worn you just about don't have to pull the lever back before moving it from forward to reverse, etc.

The problem you're having is the gate in the column does not have notches in the right places to allow a full range of motion for the lever to be able to select every position. The rooster on the 350 has different spacing than on the 700, and the 700 has one more notch. Generally when you have a 350 gate and a 700 transmission no matter how you adjust the linkage you can either not get park or not get 1st and the reverse/neutral doesn't line up quite right.